diff --git a/v2/test/configuration.py b/v2/test/configuration.py
index d594da7c0..54e54b9c9 100755
--- a/v2/test/configuration.py
+++ b/v2/test/configuration.py
@@ -239,7 +239,7 @@ def _canSetEmptyEnvironmentVariable():
     if original is None:
         os.unsetenv(dummyName)
     else:
-        os.putenv(dummyName)
+        os.putenv(dummyName, original)
     return result