diff --git a/hw/xwin/winmultiwindowwindow.c b/hw/xwin/winmultiwindowwindow.c
index dcbfaff72..44ad19302 100644
--- a/hw/xwin/winmultiwindowwindow.c
+++ b/hw/xwin/winmultiwindowwindow.c
@@ -519,7 +519,7 @@ winCreateWindowsWindow(WindowPtr pWin)
     if (winMultiWindowGetTransientFor(pWin, &daddyId)) {
         if (daddyId) {
             hFore = GetForegroundWindow();
-            if (hFore && (daddyId != (Window) GetProp(hFore, WIN_WID_PROP)))
+            if (hFore && (daddyId != (Window) (INT_PTR) GetProp(hFore, WIN_WID_PROP)))
                 hFore = NULL;
         }
     }
@@ -593,7 +593,7 @@ winCreateWindowsWindow(WindowPtr pWin)
     /* Cause any .XWinrc menus to be added in main WNDPROC */
     PostMessage(hWnd, WM_INIT_SYS_MENU, 0, 0);
 
-    SetProp(hWnd, WIN_WID_PROP, (HANDLE) winGetWindowID(pWin));
+    SetProp(hWnd, WIN_WID_PROP, (HANDLE) (INT_PTR) winGetWindowID(pWin));
 
     /* Flag that this Windows window handles its own activation */
     SetProp(hWnd, WIN_NEEDMANAGE_PROP, (HANDLE) 0);
diff --git a/hw/xwin/winmultiwindowwndproc.c b/hw/xwin/winmultiwindowwndproc.c
index 0e46ea7fe..381818789 100644
--- a/hw/xwin/winmultiwindowwndproc.c
+++ b/hw/xwin/winmultiwindowwndproc.c
@@ -343,7 +343,7 @@ winTopLevelWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
         /* */
         wmMsg.msg = 0;
         wmMsg.hwndWindow = hwnd;
-        wmMsg.iWindow = (Window) GetProp(hwnd, WIN_WID_PROP);
+        wmMsg.iWindow = (Window) (INT_PTR) GetProp(hwnd, WIN_WID_PROP);
 
         wmMsg.iX = pDraw->x;
         wmMsg.iY = pDraw->y;
@@ -391,8 +391,8 @@ winTopLevelWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
         /* */
         SetProp(hwnd,
                 WIN_WID_PROP,
-                (HANDLE) winGetWindowID(((LPCREATESTRUCT) lParam)->
-                                        lpCreateParams));
+                (HANDLE) (INT_PTR) winGetWindowID(((LPCREATESTRUCT) lParam)->
+                                                  lpCreateParams));
 
         /*
          * Make X windows' Z orders sync with Windows windows because
diff --git a/hw/xwin/winprefs.c b/hw/xwin/winprefs.c
index 05d8c874d..8936aae63 100644
--- a/hw/xwin/winprefs.c
+++ b/hw/xwin/winprefs.c
@@ -181,7 +181,7 @@ ReloadEnumWindowsProc(HWND hwnd, LPARAM lParam)
 
                 wmMsg.msg = WM_WM_ICON_EVENT;
                 wmMsg.hwndWindow = hwnd;
-                wmMsg.iWindow = (Window) GetProp(hwnd, WIN_WID_PROP);
+                wmMsg.iWindow = (Window) (INT_PTR) GetProp(hwnd, WIN_WID_PROP);
 
                 winSendMessageToWM(s_pScreenPriv->pWMInfo, &wmMsg);
             }