diff --git a/Library/Homebrew/test/cask/dsl_spec.rb b/Library/Homebrew/test/cask/dsl_spec.rb
index 61eadc8fea..0289ce608a 100644
--- a/Library/Homebrew/test/cask/dsl_spec.rb
+++ b/Library/Homebrew/test/cask/dsl_spec.rb
@@ -165,7 +165,7 @@ describe Cask::DSL, :cask do
             "zh-CN"
           end
 
-          language "en-US", default: true do
+          language "en", default: true do
             sha256 "xyz789"
             "en-US"
           end