diff --git a/bundler/lib/bundler/stub_specification.rb b/bundler/lib/bundler/stub_specification.rb
index fa071901e587..88a4257fa452 100644
--- a/bundler/lib/bundler/stub_specification.rb
+++ b/bundler/lib/bundler/stub_specification.rb
@@ -64,9 +64,11 @@ def default_gem?
     end
 
     def full_gem_path
-      # deleted gems can have their stubs return nil, so in that case grab the
-      # expired path from the full spec
-      stub.full_gem_path || method_missing(:full_gem_path)
+      stub.full_gem_path
+    end
+
+    def full_gem_path=(path)
+      stub.full_gem_path = path
     end
 
     def full_require_paths
diff --git a/bundler/spec/install/gems/standalone_spec.rb b/bundler/spec/install/gems/standalone_spec.rb
index 5cbb484c682c..0bbd8291485f 100644
--- a/bundler/spec/install/gems/standalone_spec.rb
+++ b/bundler/spec/install/gems/standalone_spec.rb
@@ -147,9 +147,16 @@
       bundle "lock", :dir => cwd, :artifice => "compact_index"
     end
 
-    it "works" do
+    it "works and points to the vendored copies, not to the default copies" do
       bundle "config set --local path #{bundled_app("bundle")}"
       bundle :install, :standalone => true, :dir => cwd, :artifice => "compact_index", :env => { "BUNDLER_GEM_DEFAULT_DIR" => system_gem_path.to_s }
+
+      load_path_lines = bundled_app("bundle/bundler/setup.rb").read.split("\n").select {|line| line.start_with?("$:.unshift") }
+
+      expect(load_path_lines).to eq [
+        '$:.unshift File.expand_path("#{__dir__}/../#{RUBY_ENGINE}/#{RbConfig::CONFIG["ruby_version"]}/gems/bar-1.0.0/lib")',
+        '$:.unshift File.expand_path("#{__dir__}/../#{RUBY_ENGINE}/#{RbConfig::CONFIG["ruby_version"]}/gems/foo-1.0.0/lib")',
+      ]
     end
   end