diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 47fc35398988..1b36c13f34da 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -741,7 +741,8 @@ nsGlobalWindow::nsGlobalWindow(nsGlobalWindow *aOuterWindow)
   if (!PR_GetEnv("MOZ_QUIET")) {
     printf("++DOMWINDOW == %d (%p) [serial = %d] [outer = %p]\n", gRefCnt,
            static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
-           gSerialCounter, static_cast<void*>(aOuterWindow));
+           gSerialCounter,
+           static_cast<void*>(static_cast<nsIScriptGlobalObject*>(aOuterWindow)));
   }
 #endif
 
@@ -816,9 +817,10 @@ nsGlobalWindow::~nsGlobalWindow()
       }
     }
 
+    nsGlobalWindow* outer = static_cast<nsGlobalWindow*>(mOuterWindow.get());
     printf("--DOMWINDOW == %d (%p) [serial = %d] [outer = %p] [url = %s]\n",
            gRefCnt, static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
-           mSerial, static_cast<void*>(mOuterWindow.get()), url.get());
+           mSerial, static_cast<void*>(static_cast<nsIScriptGlobalObject*>(outer)), url.get());
   }
 #endif