diff --git a/inc_functions.sh b/inc_functions.sh
index c7495a238179e53fe49d097f10c95ee5528d9095..cfd41957fe3c868808835ba65ce6ca596d69f17d 100644
--- a/inc_functions.sh
+++ b/inc_functions.sh
@@ -52,7 +52,7 @@
   # echo if there is an interactive shell
   # params  string(s)  message to log
   function _echo(){
-    test $isInteractiveShell && echo "$*"
+    test "$isInteractiveShell" = "true" && echo "$*"
   }
 
 # ======================================================================