diff --git a/lib/git/lib.rb b/lib/git/lib.rb
index fc390af5..bf45af79 100644
--- a/lib/git/lib.rb
+++ b/lib/git/lib.rb
@@ -747,6 +747,7 @@ def fetch(remote, opts)
       arr_opts << opts[:ref] if opts[:ref]
       arr_opts << '--tags' if opts[:t] || opts[:tags]
       arr_opts << '--prune' if opts[:p] || opts[:prune]
+      arr_opts << '--unshallow' if opts[:unshallow]
 
       command('fetch', arr_opts)
     end
diff --git a/tests/units/test_lib.rb b/tests/units/test_lib.rb
index ff5446f1..25e42022 100644
--- a/tests/units/test_lib.rb
+++ b/tests/units/test_lib.rb
@@ -13,7 +13,16 @@ def setup
     set_file_paths
     @lib = Git.open(@wdir).lib
   end
-  
+
+  def test_fetch_unshallow
+    in_temp_dir do |dir|
+      git = Git.clone("file://#{@wdir}", "shallow", path: dir, depth: 1).lib
+      assert_equal(1,  git.log_commits.length)
+      git.fetch("file://#{@wdir}", unshallow: true)
+      assert_equal(71,  git.log_commits.length)
+    end
+  end
+
   def test_commit_data
     data = @lib.commit_data('1cc8667014381')
     assert_equal('scott Chacon <schacon@agadorsparticus.corp.reactrix.com> 1194561188 -0800', data['author'])