diff --git a/material/partials/languages/ja.html b/material/partials/languages/ja.html
index 4c866d12e..3da47ab9c 100644
--- a/material/partials/languages/ja.html
+++ b/material/partials/languages/ja.html
@@ -9,7 +9,7 @@
   "announce.dismiss": "非表示にします",
   "blog.archive": "過去の投稿",
   "blog.categories": "カテゴリー",
-  "blog.categories.in": "",
+  "blog.categories.in": " ",
   "blog.continue": "続きを読む",
   "blog.draft": "下書き",
   "blog.index": "ブログトップへ戻る",
diff --git a/src/partials/languages/ja.html b/src/partials/languages/ja.html
index cce48ec7c..fc38b6803 100644
--- a/src/partials/languages/ja.html
+++ b/src/partials/languages/ja.html
@@ -29,7 +29,7 @@
   "announce.dismiss": "非表示にします",
   "blog.archive": "過去の投稿",
   "blog.categories": "カテゴリー",
-  "blog.categories.in": "",
+  "blog.categories.in": " ",
   "blog.continue": "続きを読む",
   "blog.draft": "下書き",
   "blog.index": "ブログトップへ戻る",