diff --git a/lib/has_aux_table.rb b/lib/has_aux_table.rb
index 8fdcc68..d933958 100644
--- a/lib/has_aux_table.rb
+++ b/lib/has_aux_table.rb
@@ -241,7 +241,7 @@ module HasAuxTable
         method = self.instance_method(method_name)
         self.define_method(method_name) do |name, *args, **kwargs, &block|
           T.bind(self, ActiveRecord::Base)
-          if config.aux.column_names.include?(name)
+          if config.aux.column_names.include?(name.to_s)
             target = config.aux_model_for(self)
             T.unsafe(target).send(method_name, name, *args, **kwargs, &block)
           else
diff --git a/spec/active_record/has_aux_table_spec.rb b/spec/active_record/has_aux_table_spec.rb
index 1a602d5..e7fb1df 100644
--- a/spec/active_record/has_aux_table_spec.rb
+++ b/spec/active_record/has_aux_table_spec.rb
@@ -77,6 +77,14 @@ RSpec.describe HasAuxTable do
     )
   end
 
+  it "reads attributes with read_attribute" do
+    car = Car.create!(name: "Honda Civic", fuel_type: "gasoline")
+    expect(car.read_attribute("name")).to eq("Honda Civic")
+    expect(car.read_attribute(:name)).to eq("Honda Civic")
+    expect(car.read_attribute("fuel_type")).to eq("gasoline")
+    expect(car.read_attribute(:fuel_type)).to eq("gasoline")
+  end
+
   it "can be created as the base class" do
     vehicle = Vehicle.create(type: "Vehicle", name: "big tractor")
     expect(vehicle.attributes).to match(