diff --git a/test/mmtk/helper.rb b/test/mmtk/helper.rb
index 828b3a2b51..3bede9ed30 100644
--- a/test/mmtk/helper.rb
+++ b/test/mmtk/helper.rb
@@ -18,7 +18,9 @@ module MMTk
     end
 
     def teardown
-      EnvUtil.timeout_scale = @original_timeout_scale
+      if using_mmtk?
+        EnvUtil.timeout_scale = @original_timeout_scale
+      end
     end
 
     private