diff --git a/README.md b/README.md
index 67c06147128..c3e06902a77 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ $ rails test:all
 ### 普通のブラウザーでテスト
 
 ```
-$ HEADFULL=1 rails test:all
+$ HEADFUL=1 rails test:all
 ```
 
 ### 並列実行せずにテスト
diff --git a/test/application_system_test_case.rb b/test/application_system_test_case.rb
index bad4092a098..56266f91224 100644
--- a/test/application_system_test_case.rb
+++ b/test/application_system_test_case.rb
@@ -22,7 +22,7 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   include MockEnvHelper
   include ArticleHelper
 
-  if ENV['HEADFULL']
+  if ENV['HEADFUL']
     driven_by :selenium, using: :chrome
   else
     driven_by(:selenium, using: :headless_chrome) do |driver_option|