diff --git a/lib/webrick/webrick.gemspec b/lib/webrick/webrick.gemspec
index 83b8e74403..34821b8ac5 100644
--- a/lib/webrick/webrick.gemspec
+++ b/lib/webrick/webrick.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   if s.respond_to?(:metadata=)
     s.metadata = {
-      "bug_tracker_uri" => "https://bugs.ruby-lang.org/projects/ruby-trunk/issues"
+      "bug_tracker_uri" => "https://bugs.ruby-lang.org/projects/ruby-trunk/issues",
       "homepage_uri" => "https://www.ruby-lang.org",
       "source_code_uri" => "https://svn.ruby-lang.org/repos/ruby"
     }