diff --git a/bundler/lib/bundler/plugin/api/source.rb b/bundler/lib/bundler/plugin/api/source.rb
index 56e97f4aa415..e1f0826874d0 100644
--- a/bundler/lib/bundler/plugin/api/source.rb
+++ b/bundler/lib/bundler/plugin/api/source.rb
@@ -260,7 +260,7 @@ def to_lock
         end
 
         def to_s
-          "plugin source for #{options[:type]} with uri #{uri}"
+          "plugin source for #{@type} with uri #{@uri}"
         end
 
         # Note: Do not override if you don't know what you are doing.
diff --git a/bundler/spec/bundler/plugin/api/source_spec.rb b/bundler/spec/bundler/plugin/api/source_spec.rb
index 2c50ff56a43a..428ceb220a03 100644
--- a/bundler/spec/bundler/plugin/api/source_spec.rb
+++ b/bundler/spec/bundler/plugin/api/source_spec.rb
@@ -79,4 +79,10 @@
       end
     end
   end
+
+  describe "to_s" do
+    it "returns the string with type and uri" do
+      expect(source.to_s).to eq("plugin source for spec_type with uri uri://to/test")
+    end
+  end
 end