diff --git a/aws-sdk-core/spec/seahorse/client/plugin_list_spec.rb b/aws-sdk-core/spec/seahorse/client/plugin_list_spec.rb
index 50e0f72..3f3e7ef 100644
--- a/aws-sdk-core/spec/seahorse/client/plugin_list_spec.rb
+++ b/aws-sdk-core/spec/seahorse/client/plugin_list_spec.rb
@@ -85,7 +85,7 @@ module Seahorse
         it 'requires prefixes from plugin names when loading' do
           expect(Kernel.const_defined?(:SeahorseFixtures)).to eq(false)
           prefix = File.dirname(File.dirname(File.dirname(__FILE__)))
-          plugins.add("#{prefix}/fixtures/plugin.SeahorseFixtures::Plugin")
+          plugins.add("fixtures/plugin.SeahorseFixtures::Plugin")
           expect(plugins.to_a).to eq([SeahorseFixtures::Plugin])
         end