diff --git a/mozilla/content/xml/document/src/nsXMLContentSink.cpp b/mozilla/content/xml/document/src/nsXMLContentSink.cpp
index a53ee6584b1..c06571cc671 100644
--- a/mozilla/content/xml/document/src/nsXMLContentSink.cpp
+++ b/mozilla/content/xml/document/src/nsXMLContentSink.cpp
@@ -790,7 +790,7 @@ nsXMLContentSink::ProcessBASETag()
   return rv;
 }
 
-static IsAlternateHTTPStyleSheetHeader(const nsAString& aRel)
+static PRBool IsAlternateHTTPStyleSheetHeader(const nsAString& aRel)
 {
   nsStringArray linkTypes;
   nsStyleLinkElement::ParseLinkTypes(aRel, linkTypes);