diff --git a/ext/pdo_firebird/tests/rowCount.phpt b/ext/pdo_firebird/tests/rowCount.phpt
index 02029ceef90..3d7f71c83b6 100644
--- a/ext/pdo_firebird/tests/rowCount.phpt
+++ b/ext/pdo_firebird/tests/rowCount.phpt
@@ -38,6 +38,7 @@ $dbh->commit();
 
 $dbh->exec('DROP TABLE testz');
 
+unset($stmt);
 unset($dbh);
 
 ?>