diff --git a/lib/rbs/cli.rb b/lib/rbs/cli.rb
index 52e483e79..f8c855e36 100644
--- a/lib/rbs/cli.rb
+++ b/lib/rbs/cli.rb
@@ -990,7 +990,7 @@ def run_annotate(args, options)
       args.each do |file|
         path = Pathname(file)
         if path.directory?
-          Pathname.glob((path + "**/*.rbs").to_s).each do |path|
+          path.glob("**/*.rbs").each do |path|
             stdout.puts "Processing #{path}..."
             annotator.annotate_file(path)
           end
diff --git a/lib/rbs/file_finder.rb b/lib/rbs/file_finder.rb
index 7b8199a1f..020dfe81f 100644
--- a/lib/rbs/file_finder.rb
+++ b/lib/rbs/file_finder.rb
@@ -12,7 +12,7 @@ def self.each_file(path, immediate: nil, skip_hidden:, &block)
         yield path
 
       when path.directory?
-        paths = Pathname.glob("#{path}/**/*.rbs")
+        paths = path.glob("**/*.rbs")
 
         if skip_hidden
           paths.select! do |child|
diff --git a/test/rbs/file_finder_test.rb b/test/rbs/file_finder_test.rb
index 836a9c65a..dda51455f 100644
--- a/test/rbs/file_finder_test.rb
+++ b/test/rbs/file_finder_test.rb
@@ -44,4 +44,12 @@ def test_dir_path
     assert_equal [tmpdir + "_private/app/x.rbs"], FileFinder.each_file(tmpdir + "_private", skip_hidden: true).to_a
     assert_equal [tmpdir + "_private/_internal/y.rbs", tmpdir + "_private/app/x.rbs"], FileFinder.each_file(tmpdir + "_private", skip_hidden: false).to_a
   end
+
+  def test_dir_path_with_glob_metacharacters
+    (tmpdir / "sig[1]").mkpath
+    (tmpdir / "sig[1]/c.rbs").write("")
+
+    assert_equal [tmpdir + "sig[1]/c.rbs"], FileFinder.each_file(tmpdir + "sig[1]", skip_hidden: true).to_a
+    assert_equal [tmpdir + "sig[1]/c.rbs"], FileFinder.each_file(tmpdir + "sig[1]", skip_hidden: false).to_a
+  end
 end