diff --git a/src/video/vita/SDL_vitamessagebox.c b/src/video/vita/SDL_vitamessagebox.c
index 09c8ae19b..a3969d795 100644
--- a/src/video/vita/SDL_vitamessagebox.c
+++ b/src/video/vita/SDL_vitamessagebox.c
@@ -53,7 +53,7 @@ int VITA_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
     param.mode = SCE_MSG_DIALOG_MODE_USER_MSG;
 
     SDL_zero(msgParam);
-    SDL_snprintf(message, 512, "%s\r\n\r\n%s", messageboxdata->title, messageboxdata->message);
+    SDL_snprintf(message, sizeof(message), "%s\r\n\r\n%s", messageboxdata->title, messageboxdata->message);
 
     msgParam.msg = (const SceChar8*)message;
     SDL_zero(buttonParam);