diff --git a/lib/activerecord-multi-tenant/model_extensions.rb b/lib/activerecord-multi-tenant/model_extensions.rb
index 40e9ca3..a281113 100644
--- a/lib/activerecord-multi-tenant/model_extensions.rb
+++ b/lib/activerecord-multi-tenant/model_extensions.rb
@@ -79,7 +79,7 @@ def inherited(subclass)
         after_initialize proc { |record|
           if MultiTenant.current_tenant_id &&
              (!record.attribute_present?(partition_key) || record.public_send(partition_key.to_sym).nil?)
-            record.public_send("#{partition_key}=".to_sym, MultiTenant.current_tenant_id)
+            record.public_send(:"#{partition_key}=", MultiTenant.current_tenant_id)
           end
         }