diff --git a/trytond-gis/trytond_gis/fields.py b/trytond-gis/trytond_gis/fields.py
index 051da9c1fa..53e873308e 100644
--- a/trytond-gis/trytond_gis/fields.py
+++ b/trytond-gis/trytond_gis/fields.py
@@ -55,7 +55,7 @@ class Geometry(fields.Field):
     def definition(self, model, language):
         definition = super().definition(model, language)
         definition['dimension'] = self.dimension
-        definition['geometry_type'] = self.geometry_type
+        definition['geometry_type'] = self._geometry_type
         return definition