diff --git a/lib/bundler/dependency.rb b/lib/bundler/dependency.rb
index 7f94079e09..52c6fff194 100644
--- a/lib/bundler/dependency.rb
+++ b/lib/bundler/dependency.rb
@@ -151,7 +151,7 @@ module Bundler
     def to_lock
       out = super
       out << "!" if source
-      out << "\n"
+      out
     end
 
     def specific?
diff --git a/lib/bundler/lockfile_generator.rb b/lib/bundler/lockfile_generator.rb
index 0578a93fdc..23413dbdd6 100644
--- a/lib/bundler/lockfile_generator.rb
+++ b/lib/bundler/lockfile_generator.rb
@@ -60,7 +60,7 @@ module Bundler
       handled = []
       definition.dependencies.sort_by(&:to_s).each do |dep|
         next if handled.include?(dep.name)
-        out << dep.to_lock
+        out << dep.to_lock << "\n"
         handled << dep.name
       end
     end
diff --git a/spec/bundler/bundler/dependency_spec.rb b/spec/bundler/bundler/dependency_spec.rb
new file mode 100644
index 0000000000..f470152996
--- /dev/null
+++ b/spec/bundler/bundler/dependency_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+RSpec.describe Bundler::Dependency do
+  let(:options) do
+    {}
+  end
+  let(:dependency) do
+    described_class.new(
+      "test_gem",
+      "1.0.0",
+      options
+    )
+  end
+
+  describe "to_lock" do
+    it "returns formatted string" do
+      expect(dependency.to_lock).to eq("  test_gem (= 1.0.0)")
+    end
+
+    it "matches format of Gem::Dependency#to_lock" do
+      gem_dependency = Gem::Dependency.new("test_gem", "1.0.0")
+      expect(dependency.to_lock).to eq(gem_dependency.to_lock)
+    end
+
+    context "when source is passed" do
+      let(:options) do
+        {
+          "source" => Bundler::Source::Git.new({}),
+        }
+      end
+
+      it "returns formatted string with exclamation mark" do
+        expect(dependency.to_lock).to eq("  test_gem (= 1.0.0)!")
+      end
+    end
+  end
+end