diff --git a/wii/libogc/include/ogcsys.h b/wii/libogc/include/ogcsys.h
index 3c52eccd90..aa403d66ad 100644
--- a/wii/libogc/include/ogcsys.h
+++ b/wii/libogc/include/ogcsys.h
@@ -32,7 +32,9 @@
 	extern "C" {
 #endif
 
+#ifndef _POSIX_TIMERS
 int nanosleep(struct timespec *tb);
+#endif
 
 #ifdef __cplusplus
 	}