diff --git a/mozilla/content/xslt/src/xpath/txXPathTreeWalker.h b/mozilla/content/xslt/src/xpath/txXPathTreeWalker.h
index b558ffbcb25..b052a738b95 100644
--- a/mozilla/content/xslt/src/xpath/txXPathTreeWalker.h
+++ b/mozilla/content/xslt/src/xpath/txXPathTreeWalker.h
@@ -72,7 +72,7 @@ class nsIDOMDocument;
 class txXPathTreeWalker
 {
 public:
-    explicit txXPathTreeWalker(const txXPathTreeWalker& aOther);
+    txXPathTreeWalker(const txXPathTreeWalker& aOther);
     explicit txXPathTreeWalker(const txXPathNode& aNode);
     ~txXPathTreeWalker();