diff --git a/mozilla/xpfe/components/filepicker/src/nsWildCard.cpp b/mozilla/xpfe/components/filepicker/src/nsWildCard.cpp
index 1e40253e950..d308ecca457 100644
--- a/mozilla/xpfe/components/filepicker/src/nsWildCard.cpp
+++ b/mozilla/xpfe/components/filepicker/src/nsWildCard.cpp
@@ -416,6 +416,7 @@ ns_WildCardMatch(const T *str, const T *xp, PRBool case_insensitive)
         return _shexp_match(str, xp, case_insensitive, 0);
 
     expr = (T *) NS_Alloc((nsCharTraits<T>::length(xp) + 1) * sizeof(T));
+    memcpy(expr, xp, (nsCharTraits<T>::length(xp) + 1) * sizeof(T));
     if(!expr)
         return NOMATCH;