Fix constant name.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index c337842..259e592 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -854,7 +854,7 @@
         if refleak:
             return FAILED, test_time
         if environment.changed:
-            return ENVIRONMENT_CHANGED, test_time
+            return ENV_CHANGED, test_time
         # Except in verbose mode, tests should not print anything
         if verbose or huntrleaks:
             return PASSED, test_time