diff --git a/books/free-programming-books-ja.md b/books/free-programming-books-ja.md
index 0b899a25c..3fc04dbd5 100644
--- a/books/free-programming-books-ja.md
+++ b/books/free-programming-books-ja.md
@@ -359,7 +359,7 @@
 
 #### Gradle
 
-* [Gradle 日本語ドキュメント](http://gradle.monochromeroad.com/docs) - Hayashi Masatoshi, Sekiya Kazuchika, Sue Nobuhiro, Mochida Shinya ([PDF](http://gradle.monochromeroad.com/docs/userguide/userguide.pdf))
+* [Gradle 日本語ドキュメント](http://gradle.monochromeroad.com/docs) - Hayashi Masatoshi, Sekiya Kazuchika, Sue Nobuhiro, Mochida Shinya 
 
 
 #### Grails