diff --git a/src/Dibi/Drivers/FirebirdDriver.php b/src/Dibi/Drivers/FirebirdDriver.php
index a730a94..c1fc091 100644
--- a/src/Dibi/Drivers/FirebirdDriver.php
+++ b/src/Dibi/Drivers/FirebirdDriver.php
@@ -284,7 +284,7 @@ class FirebirdDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 		if (!$value instanceof \DateTimeInterface) {
 			$value = new Dibi\DateTime($value);
 		}
-		return $value->format("'Y-m-d H:i:s.u'");
+		return "'" . substr($value->format('Y-m-d H:i:s.u'), 0, -2) . "'";
 	}