diff --git a/src/Dibi/Connection.php b/src/Dibi/Connection.php
index f28c1dd3..c37875e4 100644
--- a/src/Dibi/Connection.php
+++ b/src/Dibi/Connection.php
@@ -365,7 +365,7 @@ class Connection
 		if ($id < 1) {
 			throw new Exception('Cannot retrieve last generated ID.');
 		}
-		return (int) $id;
+		return Helpers::intVal($id);
 	}
 
 
diff --git a/src/Dibi/DataSource.php b/src/Dibi/DataSource.php
index de0a4c89..d9f10218 100644
--- a/src/Dibi/DataSource.php
+++ b/src/Dibi/DataSource.php
@@ -283,9 +283,9 @@ FROM %SQL', $this->sql, '
 	{
 		if ($this->count === null) {
 			$this->count = $this->conds || $this->offset || $this->limit
-				? (int) $this->connection->nativeQuery(
+				? Helpers::intVal($this->connection->nativeQuery(
 					'SELECT COUNT(*) FROM (' . $this->__toString() . ') t'
-				)->fetchSingle()
+				)->fetchSingle())
 				: $this->getTotalCount();
 		}
 		return $this->count;
@@ -299,9 +299,9 @@ FROM %SQL', $this->sql, '
 	public function getTotalCount()
 	{
 		if ($this->totalCount === null) {
-			$this->totalCount = (int) $this->connection->nativeQuery(
+			$this->totalCount = Helpers::intVal($this->connection->nativeQuery(
 				'SELECT COUNT(*) FROM ' . $this->sql
-			)->fetchSingle();
+			)->fetchSingle());
 		}
 		return $this->totalCount;
 	}
diff --git a/src/Dibi/Drivers/FirebirdDriver.php b/src/Dibi/Drivers/FirebirdDriver.php
index 4d65f18b..84fa31c5 100644
--- a/src/Dibi/Drivers/FirebirdDriver.php
+++ b/src/Dibi/Drivers/FirebirdDriver.php
@@ -359,7 +359,9 @@ class FirebirdDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	{
 		if ($limit > 0 || $offset > 0) {
 			// http://www.firebirdsql.org/refdocs/langrefupd20-select.html
-			$sql = 'SELECT ' . ($limit > 0 ? 'FIRST ' . (int) $limit : '') . ($offset > 0 ? ' SKIP ' . (int) $offset : '') . ' * FROM (' . $sql . ')';
+			$sql = 'SELECT ' . ($limit > 0 ? 'FIRST ' . Dibi\Helpers::intVal($limit) : '')
+				. ($offset > 0 ? ' SKIP ' . Dibi\Helpers::intVal($offset) : '')
+				. ' * FROM (' . $sql . ')';
 		}
 	}
 
diff --git a/src/Dibi/Drivers/MsSqlDriver.php b/src/Dibi/Drivers/MsSqlDriver.php
index 4962f8ba..37f07e7e 100644
--- a/src/Dibi/Drivers/MsSqlDriver.php
+++ b/src/Dibi/Drivers/MsSqlDriver.php
@@ -315,7 +315,7 @@ class MsSqlDriver implements Dibi\Driver, Dibi\ResultDriver
 			throw new Dibi\NotSupportedException('Negative offset or limit.');
 
 		} elseif ($limit !== null) {
-			$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ') t';
+			$sql = 'SELECT TOP ' . Dibi\Helpers::intVal($limit) . ' * FROM (' . $sql . ') t';
 		}
 	}
 
diff --git a/src/Dibi/Drivers/MsSqlReflector.php b/src/Dibi/Drivers/MsSqlReflector.php
index 83784b4e..24dbf4ab 100644
--- a/src/Dibi/Drivers/MsSqlReflector.php
+++ b/src/Dibi/Drivers/MsSqlReflector.php
@@ -69,12 +69,12 @@ class MsSqlReflector implements Dibi\Reflector
 		if (!is_array($row) || count($row) < 1) {
 			if ($fallback) {
 				$row = $this->driver->query("SELECT COUNT(*) FROM {$this->driver->escapeIdentifier($table)}")->fetch(false);
-				$count = (int) ($row[0]);
+				$count = Dibi\Helpers::intVal($row[0]);
 			} else {
 				$count = false;
 			}
 		} else {
-			$count = (int) ($row[0]);
+			$count = Dibi\Helpers::intVal($row[0]);
 		}
 
 		return $count;
diff --git a/src/Dibi/Drivers/MySqlDriver.php b/src/Dibi/Drivers/MySqlDriver.php
index 629a7541..7d6dcd06 100644
--- a/src/Dibi/Drivers/MySqlDriver.php
+++ b/src/Dibi/Drivers/MySqlDriver.php
@@ -397,8 +397,8 @@ class MySqlDriver implements Dibi\Driver, Dibi\ResultDriver
 
 		} elseif ($limit !== null || $offset) {
 			// see http://dev.mysql.com/doc/refman/5.0/en/select.html
-			$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : (int) $limit)
-				. ($offset ? ' OFFSET ' . (int) $offset : '');
+			$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : Dibi\Helpers::intVal($limit))
+				. ($offset ? ' OFFSET ' . Dibi\Helpers::intVal($offset) : '');
 		}
 	}
 
diff --git a/src/Dibi/Drivers/MySqliDriver.php b/src/Dibi/Drivers/MySqliDriver.php
index cd06fa18..34af4fbd 100644
--- a/src/Dibi/Drivers/MySqliDriver.php
+++ b/src/Dibi/Drivers/MySqliDriver.php
@@ -405,8 +405,8 @@ class MySqliDriver implements Dibi\Driver, Dibi\ResultDriver
 
 		} elseif ($limit !== null || $offset) {
 			// see http://dev.mysql.com/doc/refman/5.0/en/select.html
-			$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : (int) $limit)
-				. ($offset ? ' OFFSET ' . (int) $offset : '');
+			$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : Dibi\Helpers::intVal($limit))
+				. ($offset ? ' OFFSET ' . Dibi\Helpers::intVal($offset) : '');
 		}
 	}
 
diff --git a/src/Dibi/Drivers/OdbcDriver.php b/src/Dibi/Drivers/OdbcDriver.php
index 52a93350..6ba663d5 100644
--- a/src/Dibi/Drivers/OdbcDriver.php
+++ b/src/Dibi/Drivers/OdbcDriver.php
@@ -339,7 +339,7 @@ class OdbcDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 			throw new Dibi\NotSupportedException('Negative offset or limit.');
 
 		} elseif ($limit !== null) {
-			$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ') t';
+			$sql = 'SELECT TOP ' . Dibi\Helpers::intVal($limit) . ' * FROM (' . $sql . ') t';
 		}
 	}
 
diff --git a/src/Dibi/Drivers/OracleDriver.php b/src/Dibi/Drivers/OracleDriver.php
index 6e9ead9c..598799fe 100644
--- a/src/Dibi/Drivers/OracleDriver.php
+++ b/src/Dibi/Drivers/OracleDriver.php
@@ -170,7 +170,7 @@ class OracleDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	public function getInsertId($sequence)
 	{
 		$row = $this->query("SELECT $sequence.CURRVAL AS ID FROM DUAL")->fetch(true);
-		return isset($row['ID']) ? (int) $row['ID'] : false;
+		return isset($row['ID']) ? Dibi\Helpers::intVal($row['ID']) : false;
 	}
 
 
@@ -374,10 +374,10 @@ class OracleDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 			// see http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
 			$sql = 'SELECT * FROM (SELECT t.*, ROWNUM AS "__rnum" FROM (' . $sql . ') t '
 				. ($limit !== null ? 'WHERE ROWNUM <= ' . ((int) $offset + (int) $limit) : '')
-				. ') WHERE "__rnum" > ' . (int) $offset;
+				. ') WHERE "__rnum" > ' . $offset;
 
 		} elseif ($limit !== null) {
-			$sql = 'SELECT * FROM (' . $sql . ') WHERE ROWNUM <= ' . (int) $limit;
+			$sql = 'SELECT * FROM (' . $sql . ') WHERE ROWNUM <= ' . Dibi\Helpers::intVal($limit);
 		}
 	}
 
diff --git a/src/Dibi/Drivers/PdoDriver.php b/src/Dibi/Drivers/PdoDriver.php
index c2cbddf2..73375610 100644
--- a/src/Dibi/Drivers/PdoDriver.php
+++ b/src/Dibi/Drivers/PdoDriver.php
@@ -429,24 +429,24 @@ class PdoDriver implements Dibi\Driver, Dibi\ResultDriver
 			case 'mysql':
 				if ($limit !== null || $offset) {
 					// see http://dev.mysql.com/doc/refman/5.0/en/select.html
-					$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : (int) $limit)
-						. ($offset ? ' OFFSET ' . (int) $offset : '');
+					$sql .= ' LIMIT ' . ($limit === null ? '18446744073709551615' : Dibi\Helpers::intVal($limit))
+						. ($offset ? ' OFFSET ' . Dibi\Helpers::intVal($offset) : '');
 				}
 				break;
 
 			case 'pgsql':
 				if ($limit !== null) {
-					$sql .= ' LIMIT ' . (int) $limit;
+					$sql .= ' LIMIT ' . Dibi\Helpers::intVal($limit);
 				}
 				if ($offset) {
-					$sql .= ' OFFSET ' . (int) $offset;
+					$sql .= ' OFFSET ' . Dibi\Helpers::intVal($offset);
 				}
 				break;
 
 			case 'sqlite':
 				if ($limit !== null || $offset) {
-					$sql .= ' LIMIT ' . ($limit === null ? '-1' : (int) $limit)
-						. ($offset ? ' OFFSET ' . (int) $offset : '');
+					$sql .= ' LIMIT ' . ($limit === null ? '-1' : Dibi\Helpers::intVal($limit))
+						. ($offset ? ' OFFSET ' . Dibi\Helpers::intVal($offset) : '');
 				}
 				break;
 
@@ -455,10 +455,10 @@ class PdoDriver implements Dibi\Driver, Dibi\ResultDriver
 					// see http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html
 					$sql = 'SELECT * FROM (SELECT t.*, ROWNUM AS "__rnum" FROM (' . $sql . ') t '
 						. ($limit !== null ? 'WHERE ROWNUM <= ' . ((int) $offset + (int) $limit) : '')
-						. ') WHERE "__rnum" > ' . (int) $offset;
+						. ') WHERE "__rnum" > ' . $offset;
 
 				} elseif ($limit !== null) {
-					$sql = 'SELECT * FROM (' . $sql . ') WHERE ROWNUM <= ' . (int) $limit;
+					$sql = 'SELECT * FROM (' . $sql . ') WHERE ROWNUM <= ' . Dibi\Helpers::intVal($limit);
 				}
 				break;
 
@@ -480,7 +480,7 @@ class PdoDriver implements Dibi\Driver, Dibi\ResultDriver
 					throw new Dibi\NotSupportedException('Offset is not supported by this database.');
 
 				} elseif ($limit !== null) {
-					$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ') t';
+					$sql = 'SELECT TOP ' . Dibi\Helpers::intVal($limit) . ' * FROM (' . $sql . ') t';
 					break;
 				}
 				// break omitted
diff --git a/src/Dibi/Drivers/PostgreDriver.php b/src/Dibi/Drivers/PostgreDriver.php
index ccf6150a..ef4d2d93 100644
--- a/src/Dibi/Drivers/PostgreDriver.php
+++ b/src/Dibi/Drivers/PostgreDriver.php
@@ -412,10 +412,10 @@ class PostgreDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 			throw new Dibi\NotSupportedException('Negative offset or limit.');
 		}
 		if ($limit !== null) {
-			$sql .= ' LIMIT ' . (int) $limit;
+			$sql .= ' LIMIT ' . Dibi\Helpers::intVal($limit);
 		}
 		if ($offset) {
-			$sql .= ' OFFSET ' . (int) $offset;
+			$sql .= ' OFFSET ' . Dibi\Helpers::intVal($offset);
 		}
 	}
 
diff --git a/src/Dibi/Drivers/Sqlite3Driver.php b/src/Dibi/Drivers/Sqlite3Driver.php
index f59bae27..203ca1fa 100644
--- a/src/Dibi/Drivers/Sqlite3Driver.php
+++ b/src/Dibi/Drivers/Sqlite3Driver.php
@@ -358,8 +358,8 @@ class Sqlite3Driver implements Dibi\Driver, Dibi\ResultDriver
 			throw new Dibi\NotSupportedException('Negative offset or limit.');
 
 		} elseif ($limit !== null || $offset) {
-			$sql .= ' LIMIT ' . ($limit === null ? '-1' : (int) $limit)
-				. ($offset ? ' OFFSET ' . (int) $offset : '');
+			$sql .= ' LIMIT ' . ($limit === null ? '-1' : Dibi\Helpers::intVal($limit))
+				. ($offset ? ' OFFSET ' . Dibi\Helpers::intVal($offset) : '');
 		}
 	}
 
diff --git a/src/Dibi/Fluent.php b/src/Dibi/Fluent.php
index cc0f0805..e0ae70a5 100644
--- a/src/Dibi/Fluent.php
+++ b/src/Dibi/Fluent.php
@@ -408,9 +408,9 @@ class Fluent implements IDataSource
 	 */
 	public function count()
 	{
-		return (int) $this->query([
+		return Helpers::intVal($this->query([
 			'SELECT COUNT(*) FROM (%ex', $this->_export(), ') [data]',
-		])->fetchSingle();
+		])->fetchSingle());
 	}
 
 
diff --git a/src/Dibi/Helpers.php b/src/Dibi/Helpers.php
index ea429d82..c2b094d3 100644
--- a/src/Dibi/Helpers.php
+++ b/src/Dibi/Helpers.php
@@ -282,4 +282,21 @@ class Helpers
 		fclose($handle);
 		return $count;
 	}
+
+
+	/**
+	 * @internal
+	 * @return string|int
+	 */
+	public static function intVal($value)
+	{
+		if (is_int($value)) {
+			return $value;
+		} elseif (is_string($value) && preg_match('#-?\d++\z#A', $value)) {
+			// support for long numbers - keep them unchanged
+			return is_float($number = $value * 1) ? $value : $number;
+		} else {
+			throw new Exception("Expected number, '$value' given.");
+		}
+	}
 }
diff --git a/src/Dibi/Result.php b/src/Dibi/Result.php
index e311115b..9be89174 100644
--- a/src/Dibi/Result.php
+++ b/src/Dibi/Result.php
@@ -111,7 +111,9 @@ class Result implements IDataSource
 	 */
 	final public function seek($row)
 	{
-		return ($row !== 0 || $this->fetched) ? (bool) $this->getResultDriver()->seek($row) : true;
+		return ($row != 0 || $this->fetched) // intentionally ==
+			? (bool) $this->getResultDriver()->seek($row)
+			: true;
 	}
 
 
@@ -227,8 +229,8 @@ class Result implements IDataSource
 	 */
 	final public function fetchAll($offset = null, $limit = null)
 	{
-		$limit = $limit === null ? -1 : (int) $limit;
-		$this->seek((int) $offset);
+		$limit = $limit === null ? -1 : Helpers::intVal($limit);
+		$this->seek($offset);
 		$row = $this->fetch();
 		if (!$row) {
 			return [];  // empty result set
diff --git a/src/Dibi/Translator.php b/src/Dibi/Translator.php
index d2725eaa..c1e07025 100644
--- a/src/Dibi/Translator.php
+++ b/src/Dibi/Translator.php
@@ -538,7 +538,7 @@ final class Translator
 				} elseif ($this->comment) {
 					return "(limit $arg)";
 				} else {
-					$this->limit = (int) $arg;
+					$this->limit = Helpers::intVal($arg);
 				}
 				return '';
 
@@ -548,7 +548,7 @@ final class Translator
 				} elseif ($this->comment) {
 					return "(offset $arg)";
 				} else {
-					$this->offset = (int) $arg;
+					$this->offset = Helpers::intVal($arg);
 				}
 				return '';
 
diff --git a/tests/dibi/Fluent.select.phpt b/tests/dibi/Fluent.select.phpt
index 45a85eca..4e56f5f2 100644
--- a/tests/dibi/Fluent.select.phpt
+++ b/tests/dibi/Fluent.select.phpt
@@ -142,10 +142,9 @@ if ($config['system'] === 'mysql') {
 		->limit(' 1; DROP TABLE users')
 		->offset(' 1; DROP TABLE users');
 
-	Assert::same(
-		reformat('  SELECT * LIMIT 1 OFFSET 1'),
-		(string) $fluent
-	);
+	Assert::error(function () use ($fluent) {
+		(string) $fluent;
+	}, E_USER_ERROR, "Expected number, ' 1; DROP TABLE users' given.");
 }
 
 
diff --git a/tests/dibi/Helpers.intVal().phpt b/tests/dibi/Helpers.intVal().phpt
new file mode 100644
index 00000000..d2fdc291
--- /dev/null
+++ b/tests/dibi/Helpers.intVal().phpt
@@ -0,0 +1,25 @@
+<?php
+
+use Dibi\Helpers;
+use Tester\Assert;
+
+require __DIR__ . '/bootstrap.php';
+
+
+Assert::same(0, Helpers::intVal(0));
+Assert::same(0, Helpers::intVal('0'));
+Assert::same(-10, Helpers::intVal('-10'));
+Assert::same('12345678901234567890123456879', Helpers::intVal('12345678901234567890123456879'));
+Assert::same('-12345678901234567890123456879', Helpers::intVal('-12345678901234567890123456879'));
+
+Assert::exception(function () {
+	Helpers::intVal('');
+}, 'Dibi\Exception', "Expected number, '' given.");
+
+Assert::exception(function () {
+	Helpers::intVal('not number');
+}, 'Dibi\Exception', "Expected number, 'not number' given.");
+
+Assert::exception(function () {
+	Helpers::intVal(null);
+}, 'Dibi\Exception', "Expected number, '' given.");