diff -r 38800d479cd4 -r e86049631677 libidav/resource.c
--- a/libidav/resource.c	Tue Dec 30 21:39:38 2025 +0100
+++ b/libidav/resource.c	Wed Dec 31 16:41:16 2025 +0100
@@ -360,7 +360,7 @@
     cxstring ns_str = cx_str(ns);
     cxstring name_str = cx_str(name);
     
-    return cx_strcat_a(a, 4, ns_str, cx_str("\0"), name_str, cx_str("\0"));
+    return cx_strcat_a(a, CX_NULLSTR, 4, ns_str, cx_str("\0"), name_str, cx_str("\0"));
 }