diff --git a/modules/swagger-codegen/src/main/resources/ruby/api_client.mustache b/modules/swagger-codegen/src/main/resources/ruby/api_client.mustache
index f2a71385cb4..bf5cd927502 100644
--- a/modules/swagger-codegen/src/main/resources/ruby/api_client.mustache
+++ b/modules/swagger-codegen/src/main/resources/ruby/api_client.mustache
@@ -274,7 +274,7 @@ module {{moduleName}}
         data = {}
         form_params.each do |key, value|
           case value
-          when File, Array, nil
+          when ::File, ::Array, nil
             # let typhoeus handle File, Array and nil parameters
             data[key] = value
           else