diff --git a/otc_metadata/services.py b/otc_metadata/services.py
index 5652986..291e07e 100644
--- a/otc_metadata/services.py
+++ b/otc_metadata/services.py
@@ -443,9 +443,9 @@ class Services(object):
         
         # Sort services
         for category in res:
-            category["services"].sort(key=lambda x: x.get("title", "").lower())
+            category["services"].sort(key=lambda x: x.get("service_title", "").lower())
 
         # Sort categories
         res.sort(key=lambda x: x.get("name", "").lower())
-        
+
         return res
\ No newline at end of file