diff --git a/content/xul/templates/src/nsXULTreeBuilder.cpp b/content/xul/templates/src/nsXULTreeBuilder.cpp
index 84acadb64ce..51904fe6f37 100644
--- a/content/xul/templates/src/nsXULTreeBuilder.cpp
+++ b/content/xul/templates/src/nsXULTreeBuilder.cpp
@@ -1705,7 +1705,7 @@ nsXULTreeBuilder::OpenSubtreeOf(nsTreeRows::Subtree* aSubtree,
 
     // Now recursively deal with any open sub-containers that just got
     // inserted. We need to do this back-to-front to avoid skewing offsets.
-    for (PRInt32 i = open.Count() - 1; i >= 0; --i) {
+    for (PRInt32 i = open.Count() - 1; i >= 0; --i) {
         PRInt32 index = NS_PTR_TO_INT32(open[i]);
 
         nsTreeRows::Subtree* child =