diff --git a/darwin-user/main.c b/darwin-user/main.c
index ade7d48..175e12f 100644
--- a/darwin-user/main.c
+++ b/darwin-user/main.c
@@ -704,7 +704,7 @@ void cpu_loop(CPUX86State *env)
 }
 #endif
 
-void usage(void)
+static void usage(void)
 {
     printf("qemu-" TARGET_ARCH " version " QEMU_VERSION ", Copyright (c) 2003-2004 Fabrice Bellard\n"
            "usage: qemu-" TARGET_ARCH " [-h] [-d opts] [-L path] [-s size] program [arguments...]\n"