diff --git a/hooks.go b/hooks.go
index 7223bd19..6e401c06 100644
--- a/hooks.go
+++ b/hooks.go
@@ -33,7 +33,9 @@ func registerDefaultErrorHandler() error {
 		"503": serviceUnavailable,
 		"504": gatewayTimeout,
 	} {
-		ErrorHandler(e, h)
+		if _, ok := ErrorMaps[e]; !ok {
+			ErrorHandler(e, h)
+		}
 	}
 	return nil
 }