diff --git a/src/lib/os.pl b/src/lib/os.pl
index e3c287e6..152077ae 100644
--- a/src/lib/os.pl
+++ b/src/lib/os.pl
@@ -138,7 +138,6 @@ argv(Argv) :-
     can_be(list, Argv),
     '$argv'(Argv0),
     (    append(Argv1, ["--"|Argv], Argv0) ->
-         \+ member("--", Argv1),
-	 true
+         \+ member("--", Argv1)
     ;    Argv = []
     ).