diff --git a/htmlparser/src/nsIDTDDebug.h b/htmlparser/src/nsIDTDDebug.h
index 34b33a217f34..3b51f603ab68 100644
--- a/htmlparser/src/nsIDTDDebug.h
+++ b/htmlparser/src/nsIDTDDebug.h
@@ -42,6 +42,7 @@
 class nsIDTD;
 class nsIParser;
 class nsVoidArray;
+// enum eHTMLTags;
 
 class nsIDTDDebug : public nsISupports {
             
diff --git a/parser/htmlparser/src/nsIDTDDebug.h b/parser/htmlparser/src/nsIDTDDebug.h
index 34b33a217f34..3b51f603ab68 100644
--- a/parser/htmlparser/src/nsIDTDDebug.h
+++ b/parser/htmlparser/src/nsIDTDDebug.h
@@ -42,6 +42,7 @@
 class nsIDTD;
 class nsIParser;
 class nsVoidArray;
+// enum eHTMLTags;
 
 class nsIDTDDebug : public nsISupports {