diff --git a/runtime/handler.go b/runtime/handler.go
index a249b3f25a6..43f8a56e8b7 100644
--- a/runtime/handler.go
+++ b/runtime/handler.go
@@ -71,7 +71,6 @@ func handleForwardResponseServerMetadata(w http.ResponseWriter, mux *ServeMux, m
 		if mux.outgoingHeaderMatcher != nil {
 			if h, ok := mux.outgoingHeaderMatcher(k); ok {
 				hKey = h
-				break
 			}
 		}
 		for i := range vs {