diff --git a/lib/active_record_doctor/detectors/missing_unique_indexes.rb b/lib/active_record_doctor/detectors/missing_unique_indexes.rb
index 8f38cf9..5db9f3e 100644
--- a/lib/active_record_doctor/detectors/missing_unique_indexes.rb
+++ b/lib/active_record_doctor/detectors/missing_unique_indexes.rb
@@ -86,7 +86,7 @@ def has_ones_without_indexes # rubocop:disable Naming/PredicateName
               else
                 [has_one.foreign_key.to_s]
               end
-            next if ignore_columns.include?("#{model.name}(#{columns.join(',')})")
+            next if ignore_columns.include?("#{has_one.klass.name}(#{columns.join(',')})")
 
             table_name = has_one.klass.table_name
             next if unique_index?(table_name, columns)
diff --git a/test/active_record_doctor/detectors/missing_unique_indexes_test.rb b/test/active_record_doctor/detectors/missing_unique_indexes_test.rb
index 326ad01..2cd1904 100644
--- a/test/active_record_doctor/detectors/missing_unique_indexes_test.rb
+++ b/test/active_record_doctor/detectors/missing_unique_indexes_test.rb
@@ -440,6 +440,26 @@ def test_config_ignore_columns
     refute_problems
   end
 
+  def test_config_ignore_columns_from_has_one
+    create_table(:users)
+      .define_model do
+        has_one :account, class_name: "TransientRecord::Models::Account"
+      end
+
+    create_table(:accounts) do |t|
+      t.integer :user_id
+    end.define_model
+
+    config_file(<<-CONFIG)
+      ActiveRecordDoctor.configure do |config|
+        config.detector :missing_unique_indexes,
+          ignore_columns: ["TransientRecord::Models::Account(user_id)"]
+      end
+    CONFIG
+
+    refute_problems
+  end
+
   class DummyValidator < ActiveModel::Validator
     def validate(record)
     end