diff --git a/packages/postgrest/lib/src/postgrest_builder.dart b/packages/postgrest/lib/src/postgrest_builder.dart
index 3b614650..fa461e5e 100644
--- a/packages/postgrest/lib/src/postgrest_builder.dart
+++ b/packages/postgrest/lib/src/postgrest_builder.dart
@@ -317,7 +317,8 @@ class PostgrestBuilder<T, S, R> implements Future<T> {
   ///
   /// [url] may be used to update based on a different url than the current one
   Uri appendSearchParams(String key, String value, [Uri? url]) {
-    final searchParams = Map<String, dynamic>.from(_url.queryParametersAll);
+    final searchParams =
+        Map<String, dynamic>.from((url ?? _url).queryParametersAll);
     searchParams[key] = [...searchParams[key] ?? [], value];
     return (url ?? _url).replace(queryParameters: searchParams);
   }
@@ -325,10 +326,10 @@ class PostgrestBuilder<T, S, R> implements Future<T> {
   /// Get new Uri with overridden queryParams
   ///
   /// [url] may be used to update based on a different url than the current one
-  Uri overrideSearchParams(String key, String value, [Uri? url]) {
+  Uri overrideSearchParams(String key, String value) {
     final searchParams = Map<String, dynamic>.from(_url.queryParametersAll);
     searchParams[key] = value;
-    return (url ?? _url).replace(queryParameters: searchParams);
+    return _url.replace(queryParameters: searchParams);
   }
 
   @override