diff --git a/mozilla/htmlparser/src/nsTagHandler.h b/mozilla/htmlparser/src/nsTagHandler.h
index 9ad87bea6a9..71c90a10f93 100644
--- a/mozilla/htmlparser/src/nsTagHandler.h
+++ b/mozilla/htmlparser/src/nsTagHandler.h
@@ -51,7 +51,7 @@ public:
    * Destructor
    * @update dc 11/05/98
    */
-  ~nsTagHandler() {}
+  virtual ~nsTagHandler() {}
 
   /**
    * Sets the string (tag) for this nsTagHandler to handle
diff --git a/mozilla/parser/htmlparser/src/nsTagHandler.h b/mozilla/parser/htmlparser/src/nsTagHandler.h
index 9ad87bea6a9..71c90a10f93 100644
--- a/mozilla/parser/htmlparser/src/nsTagHandler.h
+++ b/mozilla/parser/htmlparser/src/nsTagHandler.h
@@ -51,7 +51,7 @@ public:
    * Destructor
    * @update dc 11/05/98
    */
-  ~nsTagHandler() {}
+  virtual ~nsTagHandler() {}
 
   /**
    * Sets the string (tag) for this nsTagHandler to handle