diff --git a/forms/fixkosten.php b/forms/fixkosten.php
index 5824fb6..95c99df 100644
--- a/forms/fixkosten.php
+++ b/forms/fixkosten.php
@@ -189,7 +189,7 @@
                                         FROM kostenfix kf
                                         JOIN zahlungstag zt ON zt.id = kf.zahlungstag_id
                                         JOIN zahlungsmonate zm ON zm.id = kf.zahlungsmonate_id
-                                        WHERE :monat_wert = ANY(string_to_array(zm.name, ',')::INT[])
+                                        WHERE CAST(:monat_wert AS INT) = ANY(string_to_array(zm.name, ',')::INT[])
                                         AND NOT EXISTS (SELECT *
                                                             FROM kontobewegung kb_inner
                                                             WHERE kb_inner.kostenfix_id = kf.id