diff --git a/base_geoengine/fields.py b/base_geoengine/fields.py
index e06787335b..6627e63066 100644
--- a/base_geoengine/fields.py
+++ b/base_geoengine/fields.py
@@ -103,7 +103,7 @@ def from_latlon(cls, cr, latitude, longitude):
                     ST_GeomFromText(%(wkt)s, 4326),
                     %(srid)s)
         """, {'wkt': pt.wkt,
-              'srid': cls.srid})
+              'srid': cls._slots['srid']})
         res = cr.fetchone()
         return cls.load_geo(res[0])