diff --git a/mozilla/content/xbl/src/nsXBLService.cpp b/mozilla/content/xbl/src/nsXBLService.cpp
index 0b6728bbb69..3eb9a7e90c8 100644
--- a/mozilla/content/xbl/src/nsXBLService.cpp
+++ b/mozilla/content/xbl/src/nsXBLService.cpp
@@ -728,7 +728,7 @@ nsXBLService::GetBinding(nsIContent* aBoundElement, nsIURI* aURI,
                          PRBool* aIsReady, nsXBLBinding** aResult)
 {
   // More than 6 binding URIs are rare, see bug 55070 comment 18.
-  nsTArray<nsIURI*> uris(6);
+  nsAutoTArray<nsIURI*, 6> uris;
   return GetBinding(aBoundElement, aURI, aPeekOnly, aOriginPrincipal, aIsReady,
                     aResult, uris);
 }