diff --git a/include/SDL_thread.h b/include/SDL_thread.h
index 35e680ddf..1e04a4f8f 100644
--- a/include/SDL_thread.h
+++ b/include/SDL_thread.h
@@ -129,7 +129,7 @@ SDL_CreateThread(SDL_ThreadFunction fn, const char *name, void *data,
                  pfnSDL_CurrentEndThread pfnEndThread);
 
 extern DECLSPEC SDL_Thread *SDLCALL
-SDL_CreateThreadWithStackSize(int (SDLCALL * fn) (void *),
+SDL_CreateThreadWithStackSize(SDL_ThreadFunction fn,
                  const char *name, const size_t stacksize, void *data,
                  pfnSDL_CurrentBeginThread pfnBeginThread,
                  pfnSDL_CurrentEndThread pfnEndThread);