diff --git a/docs/ja/workflow/testing.md b/docs/ja/workflow/testing.md
index 9f3d788e9..7d5fb830d 100644
--- a/docs/ja/workflow/testing.md
+++ b/docs/ja/workflow/testing.md
@@ -10,7 +10,7 @@ Karma はブラウザを起動してテストを実行するテストランナ
 npm install\
   karma karma-webpack\
   karma-jasmine jasmine-core\
-  karma-phantomjs-launcher phantomjs--prebuilt\
+  karma-phantomjs-launcher phantomjs-prebuilt\
   --save-dev
 ```