diff --git a/CHANGELOG.md b/CHANGELOG.md
index 043828c42..7d3e53a3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.12.24+6
+
+* Small refactoring to make the package compatible with strong-mode compliant Zone API.
+  No user-visible change.
+
 ## 0.12.24+5
 
 * Expose a way for tests to forward a `loadException` to the server.
diff --git a/lib/src/runner/load_suite.dart b/lib/src/runner/load_suite.dart
index d8194ddfa..308357a4b 100644
--- a/lib/src/runner/load_suite.dart
+++ b/lib/src/runner/load_suite.dart
@@ -159,7 +159,10 @@ class LoadSuite extends Suite implements RunnerSuite {
       if (pair == null) return null;
 
       var zone = pair.last;
-      var newSuite = zone.runUnaryGuarded(change, pair.first);
+      var newSuite;
+      zone.runGuarded(() {
+        newSuite = change(pair.first);
+      });
       return newSuite == null ? null : new Pair(newSuite, zone);
     }));
   }
diff --git a/pubspec.yaml b/pubspec.yaml
index 327f31e5f..5a038af39 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.24+5
+version: 0.12.24+6
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test