diff --git a/lib/long-options.h b/lib/long-options.h
index d428dd196..274e6acc3 100644
--- a/lib/long-options.h
+++ b/lib/long-options.h
@@ -1,8 +1,8 @@
 #undef __P
 #if defined (__STDC__) && __STDC__
-# define __P(args) args
+# define __P(Args) Args
 #else
-# define __P(args) ()
+# define __P(Args) ()
 #endif
 
 void