diff --git a/lib/rbs/cli.rb b/lib/rbs/cli.rb
index c645c2deb..b88c2bf3b 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|