diff --git a/engine/src/flutter/testing/dart/fragment_shader_test.dart b/engine/src/flutter/testing/dart/fragment_shader_test.dart
index 332a15ba690..ed12e9939ed 100644
--- a/engine/src/flutter/testing/dart/fragment_shader_test.dart
+++ b/engine/src/flutter/testing/dart/fragment_shader_test.dart
@@ -22,9 +22,9 @@ void main() async {
   }());
 
   test('impellerc produces reasonable JSON encoded IPLR files', () async {
-    final String path = Platform.environment['FLUTTER_FRAGMENT_SHADER_TEST_PATH']!;
+    final Directory directory = shaderDirectory('iplr-json');
     final Object? rawData = convert.json.decode(
-      File('$path/gen/flutter/lib/ui/fixtures/shaders/iplr-json/ink_sparkle.frag.iplr').readAsStringSync());
+      File(path.join(directory.path, 'ink_sparkle.frag.iplr')).readAsStringSync());
 
     expect(rawData is Map<String, Object?>, true);
 
diff --git a/engine/src/flutter/testing/run_tests.py b/engine/src/flutter/testing/run_tests.py
index 8e19e8f8823..23553c156ed 100755
--- a/engine/src/flutter/testing/run_tests.py
+++ b/engine/src/flutter/testing/run_tests.py
@@ -536,7 +536,6 @@ def GatherDartTest(
       command_args,
       forbidden_output=forbidden_output,
       expect_failure=expect_failure,
-      extra_env={'FLUTTER_FRAGMENT_SHADER_TEST_PATH': build_dir},
   )