diff --git a/spec/support/mock_intake.rb b/spec/support/mock_intake.rb
index 486a85a84..a0af9a4b3 100644
--- a/spec/support/mock_intake.rb
+++ b/spec/support/mock_intake.rb
@@ -19,7 +19,7 @@
 
 require 'json'
 require 'timeout'
-require 'rack/chunked'
+require 'rack/chunked' if ::Rack.release < '3.1.0'
 
 class MockIntake
   def initialize