diff --git a/test_problems/cathermo/HMW_dupl_test/runtest b/test_problems/cathermo/HMW_dupl_test/runtest
index 5b04008f3..522e697ea 100755
--- a/test_problems/cathermo/HMW_dupl_test/runtest
+++ b/test_problems/cathermo/HMW_dupl_test/runtest
@@ -39,6 +39,6 @@ else
   echo "unsuccessful diff comparison on $prog test"
   echo "FAILED" > csvCode.txt
   temp_success="0"
-  return 0
+  return 1
 fi