diff --git a/src/sun_mouse.c b/src/sun_mouse.c
index f6e8dbb..80e1111 100644
--- a/src/sun_mouse.c
+++ b/src/sun_mouse.c
@@ -116,13 +116,21 @@ static void vuidMouseSendScreenSize(ScreenPtr pScreen, VuidMsePtr pVuidMse);
 static void vuidMouseAdjustFrame(int index, int x, int y, int flags);
 
 static int vuidMouseGeneration = 0;
-static int vuidMouseScreenIndex;
+DevPrivateKeyRec vuidDevicePrivateKeyRec;
+#define vuidDevicePrivateKey (&vuidDevicePrivateKeyRec)
+
 #define vuidMouseGetScreenPrivate(s) ( \
-    dixLookupPrivate(&(s)->devPrivates, &vuidMouseScreenIndex))
+    dixLookupPrivate(&(s)->devPrivates, vuidDevicePrivateKey))
 #define vuidMouseSetScreenPrivate(s,p) \
-    dixSetPrivate(&(s)->devPrivates, &vuidMouseScreenIndex, (void *) p)
+    dixSetPrivate(&(s)->devPrivates, vuidDevicePrivateKey, (void *) p)
 #endif /* HAVE_ABSOLUTE_MOUSE_SCALING */
 
+static Bool 
+VuidInitPrivates(void)
+{
+    return dixRegisterPrivateKey(vuidDevicePrivateKey, PRIVATE_SCREEN, 0);
+}
+
 static inline
 VuidMsePtr getVuidMsePriv(InputInfoPtr pInfo)
 {
@@ -542,6 +550,7 @@ vuidMouseProc(DeviceIntPtr pPointer, int what)
 
     case DEVICE_INIT:
 #ifdef HAVE_ABSOLUTE_MOUSE_SCALING
+        VuidInitPrivates();
        if (vuidMouseGeneration != serverGeneration) {
                for (i = 0; i < screenInfo.numScreens; i++) {
                    ScreenPtr pScreen = screenInfo.screens[i];