diff --git a/embedding/browser/webBrowser/nsWebBrowser.cpp b/embedding/browser/webBrowser/nsWebBrowser.cpp
index 091607a76e2..16eb23c7b36 100644
--- a/embedding/browser/webBrowser/nsWebBrowser.cpp
+++ b/embedding/browser/webBrowser/nsWebBrowser.cpp
@@ -494,7 +494,9 @@ NS_IMETHODIMP nsWebBrowser::SetItemType(PRInt32 aItemType)
     NS_ENSURE_TRUE((aItemType == typeContentWrapper || aItemType == typeChromeWrapper), NS_ERROR_FAILURE);
     mContentType = aItemType;
     if (mDocShellAsItem)
-        mDocShellAsItem->SetItemType(mContentType == typeChromeWrapper ? typeChrome : typeContent);
+        mDocShellAsItem->SetItemType(mContentType == typeChromeWrapper
+                                         ? static_cast<PRInt32>(typeChrome)
+                                         : static_cast<PRInt32>(typeContent));
     return NS_OK;
 }
 
@@ -804,7 +806,8 @@ NS_IMETHODIMP nsWebBrowser::SetProperty(PRUint32 aId, PRUint32 aValue)
     case nsIWebBrowserSetup::SETUP_IS_CHROME_WRAPPER:
         {
            NS_ENSURE_TRUE((aValue == PR_TRUE || aValue == PR_FALSE), NS_ERROR_INVALID_ARG);
-           SetItemType(aValue ? typeChromeWrapper : typeContentWrapper);
+           SetItemType(aValue ? static_cast<PRInt32>(typeChromeWrapper)
+                              : static_cast<PRInt32>(typeContentWrapper));
         }
         break;
     default:
diff --git a/embedding/components/windowwatcher/src/nsWindowWatcher.cpp b/embedding/components/windowwatcher/src/nsWindowWatcher.cpp
index 1e68b58844e..ad12d0cd884 100644
--- a/embedding/components/windowwatcher/src/nsWindowWatcher.cpp
+++ b/embedding/components/windowwatcher/src/nsWindowWatcher.cpp
@@ -944,9 +944,12 @@ nsWindowWatcher::OpenWindowJSInternal(nsIDOMWindow *aParent,
       }
     }
 
-    newDocShell->LoadURI(uriToLoad, loadInfo,
-      windowIsNew ? nsIWebNavigation::LOAD_FLAGS_FIRST_LOAD :
-                    nsIWebNavigation::LOAD_FLAGS_NONE, PR_TRUE);
+    newDocShell->LoadURI(uriToLoad,
+                         loadInfo,
+                         windowIsNew
+                           ? static_cast<PRUint32>(nsIWebNavigation::LOAD_FLAGS_FIRST_LOAD)
+                           : static_cast<PRUint32>(nsIWebNavigation::LOAD_FLAGS_NONE),
+                         PR_TRUE);
   }
 
   // Copy the current session storage for the current domain.