diff --git a/include/begin_code.h b/include/begin_code.h
index aa2f88487..d48a594a3 100644
--- a/include/begin_code.h
+++ b/include/begin_code.h
@@ -120,7 +120,9 @@
 #define SDL_INLINE_OKAY
 #else
 #if !defined(__MRC__) && !defined(_SGI_SOURCE)
+#ifndef __inline__
 #define __inline__ inline
+#endif
 #define SDL_INLINE_OKAY
 #endif /* Not a funky compiler */
 #endif /* Visual C++ */