diff --git a/parser/htmlparser/src/nsExpatDriver.h b/parser/htmlparser/src/nsExpatDriver.h
index 7384d20fb9b7..2908aafe6e8a 100644
--- a/parser/htmlparser/src/nsExpatDriver.h
+++ b/parser/htmlparser/src/nsExpatDriver.h
@@ -99,7 +99,6 @@ private:
   PRPackedBool     mInCData;
   PRPackedBool     mInDoctype;
   PRPackedBool     mInExternalDTD;
-  PRPackedBool     mHandledXMLDeclaration;
   PRInt32          mBytePosition;
   nsresult         mInternalState;
   PRUint32         mBytesParsed;