diff --git a/config.json b/config.json
index 78ba49c..b536915 100644
--- a/config.json
+++ b/config.json
@@ -137,7 +137,7 @@
         // banner-ize files
         // input: list of file paths
         //
-        "banner": [ ]
+        "banner": [ "build/js", "build/css" ]
     },
     //
     // stage
diff --git a/fabfile/__init__.py b/fabfile/__init__.py
index 0bd39c4..f5b5af3 100644
--- a/fabfile/__init__.py
+++ b/fabfile/__init__.py
@@ -194,7 +194,7 @@ def banner(conf):
    
     def _do(file_path):
         puts('  %s' % file_path)  
-        with open(file_path, 'r+') as fd:
+        with _open_file(file_path, 'r+') as fd:
             s = fd.read()
             fd.seek(0)
             fd.write(_banner_text+s)