diff --git a/content/html/document/src/nsHTMLDocument.cpp b/content/html/document/src/nsHTMLDocument.cpp
index 3196c00757f..723d3a65c0f 100644
--- a/content/html/document/src/nsHTMLDocument.cpp
+++ b/content/html/document/src/nsHTMLDocument.cpp
@@ -154,7 +154,6 @@ const PRInt32 kBackward = 1;
 
 static NS_DEFINE_CID(kCookieServiceCID, NS_COOKIESERVICE_CID);
 static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
-static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
 static NS_DEFINE_CID(kCharsetAliasCID, NS_CHARSETALIAS_CID);
 
 static PRBool