diff --git a/attila/atre.py b/attila/atre.py
index ca20ad8..62f8949 100644
--- a/attila/atre.py
+++ b/attila/atre.py
@@ -368,7 +368,7 @@ def __process_ESK(self, esk):
       #Replace session values
       to_out = self.__session.replace_session_keys(esk.value)
       print(to_out)
-    elif esk.keyword in ESK.EXEC:
+    elif esk.keyword is ESK.EXEC:
       rc = system(esk.value)
       if rc != 0:
         return False