diff --git a/actionpack/lib/action_dispatch/http/parameters.rb b/actionpack/lib/action_dispatch/http/parameters.rb
index 446862aad0b30..f945a5c1a2330 100644
--- a/actionpack/lib/action_dispatch/http/parameters.rb
+++ b/actionpack/lib/action_dispatch/http/parameters.rb
@@ -60,7 +60,7 @@ def encode_params(params)
           return params
         end
 
-        params.each do |k, v|
+        params.each_value do |v|
           case v
           when Hash
             encode_params(v)