diff -r 07b815faa6ac -r f00d03835dd9 src/server/daemon/acl.c
--- a/src/server/daemon/acl.c	Tue Dec 30 21:44:49 2025 +0100
+++ b/src/server/daemon/acl.c	Tue Jan 13 18:09:20 2026 +0100
@@ -335,7 +335,7 @@
         cxmutstr wd = cx_str(cwd);
         cxmutstr pp = cx_str((char*)path);
 
-        p = cx_strcat(3, wd, cx_strn("/", 1), pp);
+        p = cx_strcat(CX_NULLSTR, 3, wd, cx_strn("/", 1), pp);
     } else {
         p = cx_strdup(cx_str((char*)path));
     }