diff --git a/lib/bundler/multilock.rb b/lib/bundler/multilock.rb
index b76cdff..a70e0eb 100644
--- a/lib/bundler/multilock.rb
+++ b/lib/bundler/multilock.rb
@@ -271,6 +271,10 @@ def after_install_all(install: true)
 
                   dependency_changes ||= spec != parent_spec
 
+                  if spec.source != parent_spec.source
+                    parent_spec = parent_spec.dup
+                    parent_spec.source = spec.source
+                  end
                   parent_spec
                 end
 
diff --git a/spec/bundler/multilock_spec.rb b/spec/bundler/multilock_spec.rb
index 9ec3dba..c453690 100644
--- a/spec/bundler/multilock_spec.rb
+++ b/spec/bundler/multilock_spec.rb
@@ -313,6 +313,34 @@
     end
   end
 
+  it "maintains consistency across local gem's lockfiless when one is included in the other" do
+    with_gemfile(<<~RUBY) do
+      lockfile("local_test/Gemfile.lock",
+               gemfile: "local_test/Gemfile")
+
+      gem "local_test", path: "local_test"
+      gem "net-smtp", "0.3.2"
+    RUBY
+      create_local_gem("local_test", <<~RUBY)
+        spec.add_dependency "net-smtp", "~> 0.3"
+      RUBY
+
+      invoke_bundler("install")
+
+      replace_lockfile_pin("local_test/Gemfile.lock", "net-smtp", "0.3.3")
+
+      # write_gemfile(<<~RUBY)
+      #   lockfile("local_test/Gemfile.lock",
+      #          gemfile: "local_test/Gemfile")
+
+      #   gem "net-smtp", "~> 0.3.2"
+      # RUBY
+
+      invoke_bundler("install")
+      expect(File.read("local_test/Gemfile.lock")).to include("0.3.2")
+    end
+  end
+
   it "syncs from a parent lockfile" do
     with_gemfile(<<~RUBY) do
       lockfile do