diff --git a/include/projekttask.class.php b/include/projekttask.class.php
index 78333abeb..5e3699387 100755
--- a/include/projekttask.class.php
+++ b/include/projekttask.class.php
@@ -280,7 +280,7 @@ class projekttask extends basis_db
 			return true;
 		}
 		
-		$qry = "DELETE FROM fue.tbl_projekttask WHERE projekttask_id='$projekttask_id'";
+		$qry = "DELETE FROM fue.tbl_projekttask WHERE projekttask_id=".addslashes($projekttask_id);
 		
 		if($this->db_query($qry))
 		{