diff --git a/dibi/drivers/mysql.php b/dibi/drivers/mysql.php
index 6400d10c..a8349baa 100644
--- a/dibi/drivers/mysql.php
+++ b/dibi/drivers/mysql.php
@@ -476,6 +476,7 @@ class DibiMySqlDriver extends DibiObject implements IDibiDriver
 				'table' => $table,
 				'nativetype' => strtoupper($type[0]),
 				'size' => isset($type[1]) ? (int) $type[1] : NULL,
+				'unsigned' => (bool) strstr('unsigned', $row['Type']),
 				'nullable' => $row['Null'] === 'YES',
 				'default' => $row['Default'],
 				'autoincrement' => $row['Extra'] === 'auto_increment',
diff --git a/dibi/drivers/mysqli.php b/dibi/drivers/mysqli.php
index d90dfee4..976da567 100644
--- a/dibi/drivers/mysqli.php
+++ b/dibi/drivers/mysqli.php
@@ -479,6 +479,7 @@ class DibiMySqliDriver extends DibiObject implements IDibiDriver
 				'table' => $table,
 				'nativetype' => strtoupper($type[0]),
 				'size' => isset($type[1]) ? (int) $type[1] : NULL,
+				'unsigned' => (bool) strstr('unsigned', $row['Type']),
 				'nullable' => $row['Null'] === 'YES',
 				'default' => $row['Default'],
 				'autoincrement' => $row['Extra'] === 'auto_increment',
diff --git a/dibi/libs/DibiDatabaseInfo.php b/dibi/libs/DibiDatabaseInfo.php
index bf67071f..8e29054d 100644
--- a/dibi/libs/DibiDatabaseInfo.php
+++ b/dibi/libs/DibiDatabaseInfo.php
@@ -532,6 +532,16 @@ class DibiColumnInfo extends DibiObject
 	/**
 	 * @return bool
 	 */
+	public function isUnsigned()
+	{
+		return isset($this->info['unsigned']) ? (bool) $this->info['unsigned'] : NULL;
+	}
+
+
+
+    /**
+	 * @return bool
+	 */
 	public function isNullable()
 	{
 		return isset($this->info['nullable']) ? (bool) $this->info['nullable'] : NULL;