--- a/content/xbl/src/nsXBLService.cpp
+++ b/content/xbl/src/nsXBLService.cpp
@@ -723,17 +723,17 @@ NS_IMETHODIMP nsXBLService::BindingReady
 }
 
 nsresult
 nsXBLService::GetBinding(nsIContent* aBoundElement, nsIURI* aURI, 
                          PRBool aPeekOnly, nsIPrincipal* aOriginPrincipal,
                          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);
 }
 
 nsresult
 nsXBLService::GetBinding(nsIContent* aBoundElement, nsIURI* aURI, 
                          PRBool aPeekOnly, nsIPrincipal* aOriginPrincipal,
                          PRBool* aIsReady, nsXBLBinding** aResult,