diff --git a/dba/caldav_functions.sql b/dba/caldav_functions.sql
index b788cd8c..a9f4ac51 100644
--- a/dba/caldav_functions.sql
+++ b/dba/caldav_functions.sql
@@ -354,6 +354,7 @@ BEGIN
   IF NOT EXISTS(        SELECT 1 FROM caldav_data WHERE dav_name = path
                   UNION SELECT 1 FROM collection WHERE dav_name = path
                   UNION SELECT 1 FROM dav_principal WHERE dav_name = path
+                  UNION SELECT 1 FROM dav_binding WHERE dav_name = path
                ) THEN
     RETURN FALSE;
   END IF;