diff --git a/hw/xwin/winclipboard/wndproc.c b/hw/xwin/winclipboard/wndproc.c
index 1ea5bc6b7..229a94879 100644
--- a/hw/xwin/winclipboard/wndproc.c
+++ b/hw/xwin/winclipboard/wndproc.c
@@ -195,7 +195,7 @@ winClipboardWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
     case WM_CHANGECBCHAIN:
     {
         winDebug("winClipboardWindowProc - WM_CHANGECBCHAIN: wParam(%x) "
-                 "lParam(%x) s_hwndNextViewer(%x)\n",
+                 "lParam(%x) s_hwndNextViewer(%p)\n",
                  wParam, lParam, s_hwndNextViewer);
 
         if ((HWND) wParam == s_hwndNextViewer) {
@@ -236,7 +236,7 @@ winClipboardWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
         first = GetClipboardViewer();   /* Get handle to first viewer in chain. */
         if (first == hwnd)
             return 0;           /* Make sure it's not us! */
-        winDebug("  WM_WM_REINIT: Replacing us(%x) with %x at head "
+        winDebug("  WM_WM_REINIT: Replacing us(%p) with %p at head "
                  "of chain\n", hwnd, s_hwndNextViewer);
         s_fCBCInitialized = FALSE;
         ChangeClipboardChain(hwnd, s_hwndNextViewer);
diff --git a/hw/xwin/winmsg.c b/hw/xwin/winmsg.c
index 56e7a097c..79399a40f 100644
--- a/hw/xwin/winmsg.c
+++ b/hw/xwin/winmsg.c
@@ -158,7 +158,7 @@ winDebugWin32Message(const char *function, HWND hwnd, UINT message,
             getenv("WIN_DEBUG_WM_USER")) {
             winDebug("%s - Message WM_USER + %d\n", function,
                      message - WM_USER);
-            winDebug("\thwnd 0x%x wParam 0x%x lParam 0x%x\n", hwnd, wParam,
+            winDebug("\thwnd 0x%p wParam 0x%x lParam 0x%x\n", hwnd, wParam,
                      lParam);
         }
     }
@@ -170,7 +170,7 @@ winDebugWin32Message(const char *function, HWND hwnd, UINT message,
         buffer[63] = 0;
         if (force || getenv("WIN_DEBUG_MESSAGES") || getenv(buffer)) {
             winDebug("%s - Message %s\n", function, MESSAGE_NAMES[message]);
-            winDebug("\thwnd 0x%x wParam 0x%x lParam 0x%x\n", hwnd, wParam,
+            winDebug("\thwnd 0x%p wParam 0x%x lParam 0x%x\n", hwnd, wParam,
                      lParam);
         }
     }