diff --git a/lib/xmet/afos.py b/lib/xmet/afos.py
index 582c01a..251e8f3 100644
--- a/lib/xmet/afos.py
+++ b/lib/xmet/afos.py
@@ -102,7 +102,7 @@ class AFOSMessage(DatabaseTable):
         'location': 'ST_AsText(location) as location'
     }
 
-    __values_write__ = {
+    __values_read__ = {
         'poly':     shapely.from_wkt,
         'location': shapely.from_wkt
     }