diff --git a/osdep.h b/osdep.h
index 3ea4af099b..1e15a4b91c 100644
--- a/osdep.h
+++ b/osdep.h
@@ -70,10 +70,12 @@ typedef signed int              int_fast16_t;
 #ifndef always_inline
 #if !((__GNUC__ < 3) || defined(__APPLE__))
 #ifdef __OPTIMIZE__
+#undef inline
 #define inline __attribute__ (( always_inline )) __inline__
 #endif
 #endif
 #else
+#undef inline
 #define inline always_inline
 #endif