diff --git a/packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart b/packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart
index 57db0fb70a..473b1155a8 100644
--- a/packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart
+++ b/packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart
@@ -165,7 +165,11 @@ void main() {
     });
 
     group('getRepoPackages', () {
+      String oldFlutterRoot;
+
       setUp(() {
+        oldFlutterRoot = Cache.flutterRoot;
+        Cache.flutterRoot = _kFlutterRoot;
         fs.directory(fs.path.join(_kFlutterRoot, 'examples'))
             .createSync(recursive: true);
         fs.directory(fs.path.join(_kFlutterRoot, 'packages'))
@@ -179,6 +183,10 @@ void main() {
             .createSync();
       });
 
+      tearDown(() {
+        Cache.flutterRoot = oldFlutterRoot;
+      });
+
       testUsingContext('', () {
         final List<String> packagePaths = runner.getRepoPackages()
             .map((Directory d) => d.path).toList();