diff --git a/lib/ransack/locale/ja.yml b/lib/ransack/locale/ja.yml
index 5f11901aa..fc5c67c2f 100644
--- a/lib/ransack/locale/ja.yml
+++ b/lib/ransack/locale/ja.yml
@@ -67,4 +67,4 @@ ja:
       present: "は存在する"
       blank: "は空である"
       'null': "無効"
-      not_null: "はnullではない"
+      not_null: "は無効ではない"