diff --git a/tools/custom_apns.py b/tools/custom_apns.py
index b58ece1b..0de116ee 100644
--- a/tools/custom_apns.py
+++ b/tools/custom_apns.py
@@ -34,7 +34,7 @@ def main(argv):
         for line in f:
             xmltree = parseString(line)
             carrier = xmltree.getElementsByTagName('apn')[0].getAttribute('carrier')
-            custom_apn_names.append(carrier)
+            custom_apn_names.append('"' + carrier + '"')
 
     with open(original_file, 'r') as input_file:
         with open(output_file_path, 'w') as output_file: