diff --git a/app.rb b/app.rb
index 4380b6e..5c73ec7 100644
--- a/app.rb
+++ b/app.rb
@@ -374,7 +374,7 @@ post "/halt" do
   nil
 end
 
-get "/pid" do
+get "/pid", provides: "json" do
   pretty = params.key? :pretty
 
   jsonify({ppid: ppid, pid: Process.pid}, pretty:)