diff --git a/test/unit/query_test.rb b/test/unit/query_test.rb
index 14a707e89209c0e69512e463c1ed977ad0d8869a..47b88bf4ac05f5f34bc7b85bdb200b2c22eba3fa 100644
--- a/test/unit/query_test.rb
+++ b/test/unit/query_test.rb
@@ -47,7 +47,7 @@ class QueryTest < GeocoderTestCase
 
   def test_custom_lookup
     query = Geocoder::Query.new("address", :lookup => :nominatim)
-    assert_equal Geocoder::Lookup::Nominatim, query.lookup.class
+    assert_instance_of Geocoder::Lookup::Nominatim, query.lookup
   end
 
   def test_force_specify_ip_address