diff --git a/utils/python/CIME/SystemTests/system_tests_compare_two_clone.py b/utils/python/CIME/SystemTests/system_tests_compare_two_clone.py
index 08429c0185ec..5dde7ec2a662 100644
--- a/utils/python/CIME/SystemTests/system_tests_compare_two_clone.py
+++ b/utils/python/CIME/SystemTests/system_tests_compare_two_clone.py
@@ -121,7 +121,7 @@ def __init__(self,
                 # which would be wrong.
                 shutil.rmtree(self._caseroot2)
                 self._activate_case1()
-                logger.warning("Test case setup failed. Case2 has been removed, "
+                logger.warning("WARNING: Test case setup failed. Case2 has been removed, "
                                "but the main case may be in an inconsistent state. "
                                "If you want to rerun this test, you should create "
                                "a new test rather than trying to rerun this one.")