diff --git a/hub/imports/geometry/geojson.py b/hub/imports/geometry/geojson.py
index a66ab7cf..29b8551e 100644
--- a/hub/imports/geometry/geojson.py
+++ b/hub/imports/geometry/geojson.py
@@ -121,7 +121,7 @@ class Geojson:
           year_of_construction = int(feature['properties'][self._year_of_construction_field])
         function = None
         if self._function_field is not None:
-          function = feature['properties'][self._function_field]
+          function = str(feature['properties'][self._function_field])
           if self._function_to_hub is not None:
             # use the transformation dictionary to retrieve the proper function
             if function in self._function_to_hub: