diff --git a/lib/ruby_wasm/rake_task.rb b/lib/ruby_wasm/rake_task.rb
index 2540f0d4d1..a0e6a3ad56 100644
--- a/lib/ruby_wasm/rake_task.rb
+++ b/lib/ruby_wasm/rake_task.rb
@@ -1,4 +1,5 @@
 require "rake/tasklib"
+require_relative "./util"
 require_relative "./build"
 
 class RubyWasm::BuildTask < ::Rake::TaskLib