diff --git a/contrib/ParseAndAddCatchTests.cmake b/contrib/ParseAndAddCatchTests.cmake
index cb2846d0..85c06a0d 100644
--- a/contrib/ParseAndAddCatchTests.cmake
+++ b/contrib/ParseAndAddCatchTests.cmake
@@ -143,6 +143,9 @@ function(ParseFile SourceFile TestTarget)
             endif()
             string(REPLACE "]" ";" Tags "${Tags}")
             string(REPLACE "[" "" Tags "${Tags}")
+        else()
+          # unset tags variable from previous loop
+          unset(Tags)
         endif()
 
         list(APPEND Labels ${Tags})