diff --git a/packages/go_router_builder/CHANGELOG.md b/packages/go_router_builder/CHANGELOG.md
index 598414fd496..c09cc587430 100644
--- a/packages/go_router_builder/CHANGELOG.md
+++ b/packages/go_router_builder/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.0.1
+
+- Fixes unnecessary whitespace in generated `RelativeGoRouteData`. 
+
 ## 4.0.0
 
 - Make Route mixins public.
diff --git a/packages/go_router_builder/README.md b/packages/go_router_builder/README.md
index 35f70c93396..a410250ced6 100644
--- a/packages/go_router_builder/README.md
+++ b/packages/go_router_builder/README.md
@@ -13,7 +13,7 @@ dependencies:
 dev_dependencies:
   # ...along with your other dev-dependencies
   build_runner: ^2.6.0
-  go_router_builder: ^3.3.0
+  go_router_builder: ^4.0.1
 ```
 
 ### Source code
diff --git a/packages/go_router_builder/example/lib/go_relative.g.dart b/packages/go_router_builder/example/lib/go_relative.g.dart
index 6863a5c5606..ef565d171a9 100644
--- a/packages/go_router_builder/example/lib/go_relative.g.dart
+++ b/packages/go_router_builder/example/lib/go_relative.g.dart
@@ -20,12 +20,10 @@ RouteBase get $homeRoute => GoRouteData.$route(
       routes: [
         RelativeGoRouteData.$route(
           path: 'details/:detailId',
-
           factory: $DetailsRoute._fromState,
           routes: [
             RelativeGoRouteData.$route(
               path: 'settings/:settingId',
-
               factory: $SettingsRoute._fromState,
             ),
           ],
@@ -34,12 +32,10 @@ RouteBase get $homeRoute => GoRouteData.$route(
     ),
     RelativeGoRouteData.$route(
       path: 'details/:detailId',
-
       factory: $DetailsRoute._fromState,
       routes: [
         RelativeGoRouteData.$route(
           path: 'settings/:settingId',
-
           factory: $SettingsRoute._fromState,
         ),
       ],
diff --git a/packages/go_router_builder/example/lib/readme_excerpts.g.dart b/packages/go_router_builder/example/lib/readme_excerpts.g.dart
index 01204eba7f1..9cfd76b05eb 100644
--- a/packages/go_router_builder/example/lib/readme_excerpts.g.dart
+++ b/packages/go_router_builder/example/lib/readme_excerpts.g.dart
@@ -360,7 +360,6 @@ mixin $MyGoRouteData on GoRouteData {
 
 RouteBase get $detailsRoute => RelativeGoRouteData.$route(
   path: 'details',
-
   factory: $DetailsRoute._fromState,
 );
 
diff --git a/packages/go_router_builder/lib/src/route_config.dart b/packages/go_router_builder/lib/src/route_config.dart
index f07486b7444..b1eab450219 100644
--- a/packages/go_router_builder/lib/src/route_config.dart
+++ b/packages/go_router_builder/lib/src/route_config.dart
@@ -572,11 +572,10 @@ mixin $_mixinName on $routeDataClassName {
   }
 
   @override
-  String get routeConstructorParameters => '''
-    path: ${escapeDartString(path)},
-    ${caseSensitive ? '' : 'caseSensitive: $caseSensitive,'}
-    ${parentNavigatorKey == null ? '' : 'parentNavigatorKey: $parentNavigatorKey,'}
-''';
+  String get routeConstructorParameters =>
+      'path: ${escapeDartString(path)},'
+      '${caseSensitive ? '' : 'caseSensitive: $caseSensitive,'}'
+      '${parentNavigatorKey == null ? '' : 'parentNavigatorKey: $parentNavigatorKey,'}';
 
   @override
   String get routeDataClassName => 'RelativeGoRouteData';
diff --git a/packages/go_router_builder/pubspec.yaml b/packages/go_router_builder/pubspec.yaml
index 755b7485392..25e088a51c7 100644
--- a/packages/go_router_builder/pubspec.yaml
+++ b/packages/go_router_builder/pubspec.yaml
@@ -2,7 +2,7 @@ name: go_router_builder
 description: >-
   A builder that supports generated strongly-typed route helpers for
   package:go_router
-version: 4.0.0
+version: 4.0.1
 repository: https://github.com/flutter/packages/tree/main/packages/go_router_builder
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router_builder%22
 
diff --git a/packages/go_router_builder/tool/run_tests.dart b/packages/go_router_builder/tool/run_tests.dart
index 02ec8083270..23b1f5bc414 100644
--- a/packages/go_router_builder/tool/run_tests.dart
+++ b/packages/go_router_builder/tool/run_tests.dart
@@ -61,12 +61,8 @@ Future<void> main() async {
       }
 
       // Apply consistent formatting to both generated and expected code for comparison.
-      final String generated = formatter.format(
-        results.join().replaceAll('\n', ''),
-      );
-      final String expected = formatter.format(
-        expectResult.replaceAll('\n', ''),
-      );
+      final String generated = formatter.format(results.join('\n\n').trim());
+      final String expected = formatter.format(expectResult.trim());
       expect(generated, equals(expected));
     }, timeout: const Timeout(Duration(seconds: 100)));
   }