diff --git a/embedding/tests/winEmbed/winEmbed.cpp b/embedding/tests/winEmbed/winEmbed.cpp
index 6f990aff168d..352a9a33722e 100644
--- a/embedding/tests/winEmbed/winEmbed.cpp
+++ b/embedding/tests/winEmbed/winEmbed.cpp
@@ -533,7 +533,7 @@ void UpdateUI(nsIWebBrowserChrome *aChrome)
     PRBool canPaste = PR_FALSE;
 
     nsCOMPtr<nsIClipboardCommands> clipCmds = do_GetInterface(webBrowser);
-    if (nsIClipboardCommands)
+    if (clipCmds)
     {
         clipCmds->CanCutSelection(&canCutSelection);
         clipCmds->CanCopySelection(&canCopySelection);