diff --git a/pungi/wrappers/lorax.py b/pungi/wrappers/lorax.py
index 724ddc32..94ac9e26 100644
--- a/pungi/wrappers/lorax.py
+++ b/pungi/wrappers/lorax.py
@@ -45,7 +45,7 @@ class LoraxWrapper(object):
         if type(f_arg) is list:
             for item in f_arg:
                 cmd_args.append("%s=%s" % (c_arg, item))
-        if type(f_arg) is str:
+        elif type(f_arg) is str:
             cmd_args.append("%s=%s" % (c_arg, item))
         else:
             raise Exception(