diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 981c061..7423706 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -5,7 +5,7 @@ set(TEST_ENVIRONMENT "K4GENERATORSCONFIG=${PROJECT_BINARY_DIR}/bin")
 set(generatorList Babayaga KKMC Madgraph Pythia Sherpa Whizard )
 foreach(generator ${generatorList})
   #  list(APPEND InputAndRunList "InputAndRun_${generator}" )
-  set(InputAndRunList ${InputAndRunList}InputAndRun_${generator}";")
+  string(APPEND InputAndRunList InputAndRun_${generator}" ")
   message(${generator} " appended to the runlist ")
 endforeach()
 message("The string is " ${InputAndRunList} )