diff --git a/extensions/xmlterm/base/mozXMLTerminal.cpp b/extensions/xmlterm/base/mozXMLTerminal.cpp
index 6c3c6eeb1136..20b02774a6bd 100644
--- a/extensions/xmlterm/base/mozXMLTerminal.cpp
+++ b/extensions/xmlterm/base/mozXMLTerminal.cpp
@@ -973,7 +973,7 @@ NS_IMETHODIMP mozXMLTerminal::MatchesCookie(const PRUnichar* aCookie,
     return NS_ERROR_NULL_POINTER;
 
   // Check if supplied cookie matches XMLTerm cookie
-  *_retval = mCookie.EqualsWithConversion(aCookie);
+  *_retval = mCookie.Equals(aCookie);
 
   if (!(*_retval)) {
     XMLT_ERROR("mozXMLTerminal::MatchesCookie: Error - Cookie mismatch\n");