diff --git a/lib/squib/args/arg_loader.rb b/lib/squib/args/arg_loader.rb
index cf9dfc5..8856158 100644
--- a/lib/squib/args/arg_loader.rb
+++ b/lib/squib/args/arg_loader.rb
@@ -65,7 +65,7 @@ module Squib
           val = instance_variable_get(attribute)
           if val.respond_to? :each
             new_val = val.map.with_index do |v, i|
-              v ||= layout[layout_args[i].to_s][param] unless layout_args[i].nil?
+              v ||= layout[layout_args[i].to_s][param.to_s] unless layout_args[i].nil?
               v ||= default
             end
             instance_variable_set(attribute, new_val)
diff --git a/spec/args/box_spec.rb b/spec/args/box_spec.rb
index 2d635b7..a30b478 100644
--- a/spec/args/box_spec.rb
+++ b/spec/args/box_spec.rb
@@ -49,8 +49,8 @@ describe Squib::Args::Box do
 
   context 'layouts' do
     let(:layout) do
-      { 'attack' => { x: 50 },
-        'defend' => { x: 60 } }
+      { 'attack' => { 'x' => 50 },
+        'defend' => { 'x' => 60 } }
     end
 
     it 'are used when not specified' do