diff --git a/src/proto_http.c b/src/proto_http.c
index 60322d4..705f3b4 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -7060,7 +7060,8 @@
 			/* The filter did not match the request, it can be
 			 * iterated through all headers.
 			 */
-			apply_filter_to_req_headers(s, req, exp);
+			if (unlikely(apply_filter_to_req_headers(s, req, exp) < 0))
+				return -1;
 		}
 	}
 	return 0;