diff --git a/build_tools/customizations.rb b/build_tools/customizations.rb
index 41eb5394e6a..53a23cf0f5b 100644
--- a/build_tools/customizations.rb
+++ b/build_tools/customizations.rb
@@ -67,7 +67,9 @@ def dynamodb_example_deep_transform(subsegment, keys)
     api('CloudFront') do |api|
 
       api['shapes'].each do |_, shape|
-        shape['members']['MaxItems']['shape'] = 'integer' if shape['members'] && shape['members']['MaxItems']
+        if shape['members'] && shape['members']['MaxItems']
+          shape['members']['MaxItems']['shape'] = 'integer'
+        end
       end
 
       api['operations'].keys.each do |name|