diff --git a/src/Dibi/Reflection/Column.php b/src/Dibi/Reflection/Column.php
index aaa6e490..45972413 100644
--- a/src/Dibi/Reflection/Column.php
+++ b/src/Dibi/Reflection/Column.php
@@ -21,8 +21,8 @@ use Dibi;
  * @property-read string $type
  * @property-read mixed $nativeType
  * @property-read int|null $size
- * @property-read bool|null $nullable
- * @property-read bool|null $autoIncrement
+ * @property-read bool $nullable
+ * @property-read bool $autoIncrement
  * @property-read mixed $default
  */
 class Column
@@ -94,15 +94,15 @@ class Column
 	}
 
 
-	public function isNullable(): ?bool
+	public function isNullable(): bool
 	{
-		return isset($this->info['nullable']) ? (bool) $this->info['nullable'] : null;
+		return !empty($this->info['nullable']);
 	}
 
 
-	public function isAutoIncrement(): ?bool
+	public function isAutoIncrement(): bool
 	{
-		return isset($this->info['autoincrement']) ? (bool) $this->info['autoincrement'] : null;
+		return !empty($this->info['autoincrement']);
 	}
 
 
diff --git a/tests/dibi/Result.meta.phpt b/tests/dibi/Result.meta.phpt
index 3fe404e2..253ab3b5 100644
--- a/tests/dibi/Result.meta.phpt
+++ b/tests/dibi/Result.meta.phpt
@@ -45,14 +45,14 @@ Assert::null($columns[0]->getVendorInfo('xxx'));
 if (!in_array($config['system'], ['sqlite', 'sqlsrv'], true)) {
 	Assert::same('i', $columns[0]->getType());
 }
-Assert::null($columns[0]->isNullable());
+Assert::false($columns[0]->isNullable());
 
 Assert::same('xXx', $columns[3]->getName());
 Assert::null($columns[3]->getTableName());
 if (!in_array($config['system'], ['sqlite', 'sqlsrv'], true)) {
 	Assert::same('i', $columns[0]->getType());
 }
-Assert::null($columns[3]->isNullable());
+Assert::false($columns[3]->isNullable());
 
 Assert::same('xXx', $info->getColumn('xxx')->getName());
 Assert::same('xXx', $info->getColumn('xXx')->getName());