diff --git a/test/foreigner/schema_dumper_test.rb b/test/foreigner/schema_dumper_test.rb
index 84651ba..00f96fb 100644
--- a/test/foreigner/schema_dumper_test.rb
+++ b/test/foreigner/schema_dumper_test.rb
@@ -51,7 +51,7 @@ def foreign_keys(table, stream)
   end
 
   test '4.1.9 loading error' do
-    Foreigner::Helper.stubs(:active_record_version).returns("4.1.9")
+    Foreigner::Helper.stubs(:active_record_version).returns Gem::Version.new("4.1.9")
     MockSchemaDumper.ignore_tables = []
     dumper = MockSchemaDumper.new
     dumper.tables(StringIO.new)