diff --git a/include/SDL_stdinc.h b/include/SDL_stdinc.h
index 71a48713f..f790cd564 100644
--- a/include/SDL_stdinc.h
+++ b/include/SDL_stdinc.h
@@ -172,6 +172,8 @@ extern DECLSPEC void SDLCALL SDL_free(void *mem);
 #  include <malloc.h>
 # elif defined(__AIX__)
   #pragma alloca
+# elif defined(__MRC__)
+   void *alloca (unsigned);
 # else
    char *alloca ();
 # endif