diff --git a/embedding/tests/mfcembed/BrowserImpl.cpp b/embedding/tests/mfcembed/BrowserImpl.cpp
index dce35af65f67..e1e3b2315ba2 100644
--- a/embedding/tests/mfcembed/BrowserImpl.cpp
+++ b/embedding/tests/mfcembed/BrowserImpl.cpp
@@ -372,7 +372,7 @@ NS_IMETHODIMP CBrowserImpl::SetVisibility(PRBool aVisibility)
     if(! m_pBrowserFrameGlue)
         return NS_ERROR_FAILURE;
 
-    m_pBrowserFrameGlue->ShowBrowserFrame(PR_TRUE);
+    m_pBrowserFrameGlue->ShowBrowserFrame(aVisibility);
 
     return NS_OK;
 }