diff --git a/lib/jwt/jwk/ec.rb b/lib/jwt/jwk/ec.rb
index b8580d56..f0d3c52e 100644
--- a/lib/jwt/jwk/ec.rb
+++ b/lib/jwt/jwk/ec.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+require 'forwardable'
 
 module JWT
   module JWK