diff --git a/lib/sinatra/base.rb b/lib/sinatra/base.rb
index 177e8147..fce5aaa5 100644
--- a/lib/sinatra/base.rb
+++ b/lib/sinatra/base.rb
@@ -1355,7 +1355,7 @@ module Sinatra
           set :running, true
           yield server if block_given?
         end
-      rescue Errno::EADDRINUSE => e
+      rescue Errno::EADDRINUSE
         $stderr.puts "== Someone is already performing on port #{port}!"
       end