diff --git a/include/proto/acl.h b/include/proto/acl.h
index 131d799..493b56e 100644
--- a/include/proto/acl.h
+++ b/include/proto/acl.h
@@ -172,7 +172,7 @@
 
 /* always fake a data retrieval */
 int acl_fetch_nothing(struct proxy *px, struct session *l4, void *l7, int dir,
-                      struct acl_expr *expr, struct sample *smp);
+                      const struct arg *args, struct sample *smp);
 
 /* always return false */
 int acl_match_nothing(struct sample *smp, struct acl_pattern *pattern);