diff --git a/core/api.py b/core/api.py
index be03038..40209b3 100644
--- a/core/api.py
+++ b/core/api.py
@@ -122,7 +122,7 @@ class PinResource(ModelResource):
         return bundle
 
     def dehydrate_tags(self, bundle):
-        return map(str, bundle.obj.tags.all())
+        return list(map(str, bundle.obj.tags.all()))
 
     def build_filters(self, filters=None):
         orm_filters = super(PinResource, self).build_filters(filters)