diff --git a/hw/xquartz/applewm.c b/hw/xquartz/applewm.c
index 7ec3f4c37..cb2855c64 100644
--- a/hw/xquartz/applewm.c
+++ b/hw/xquartz/applewm.c
@@ -149,7 +149,7 @@ AppleWMSetScreenOrigin(
     WindowPtr pWin
 )
 {
-    long data[2];
+    int32_t data[2];
 
     data[0] = (dixScreenOrigins[pWin->drawable.pScreen->myNum].x
                 + darwinMainScreenX);