diff --git a/mozilla/layout/html/base/src/nsHTMLIIDs.cpp b/mozilla/layout/html/base/src/nsHTMLIIDs.cpp
index da41abc9fa9..a1aee878893 100644
--- a/mozilla/layout/html/base/src/nsHTMLIIDs.cpp
+++ b/mozilla/layout/html/base/src/nsHTMLIIDs.cpp
@@ -41,5 +41,4 @@
 
 const nsIID kIHTMLContentIID = NS_IHTMLCONTENT_IID;
 const nsIID kIPageSequenceFrameIID = NS_IPAGESEQUENCEFRAME_IID;
-const nsIID kIStyledContentIID = NS_ISTYLEDCONTENT_IID;
 const nsIID kITextContentIID = NS_ITEXT_CONTENT_IID;