diff --git a/src/video/windows/SDL_windowswindow.c b/src/video/windows/SDL_windowswindow.c
index c28da5204..07b873f7f 100644
--- a/src/video/windows/SDL_windowswindow.c
+++ b/src/video/windows/SDL_windowswindow.c
@@ -113,7 +113,7 @@ SetupWindowData(_THIS, SDL_Window * window, HWND hwnd, SDL_bool created)
     SDL_WindowData *data;
 
     /* Allocate the window data */
-    data = (SDL_WindowData *) SDL_malloc(sizeof(*data));
+    data = (SDL_WindowData *) SDL_calloc(1, sizeof(*data));
     if (!data) {
         return SDL_OutOfMemory();
     }