diff --git a/sentry-ruby/spec/isolated/puma_spec.rb b/sentry-ruby/spec/isolated/puma_spec.rb
index 663352330..c5b99a7fc 100644
--- a/sentry-ruby/spec/isolated/puma_spec.rb
+++ b/sentry-ruby/spec/isolated/puma_spec.rb
@@ -23,6 +23,7 @@ def new_connection
     end
 
     def close
+      @server.stop(true)
       @ios.each { |io| io.close }
     end
   end