diff --git a/po-windows-installer/ja.po b/po-windows-installer/ja.po
index e66b878939..7fcf539c33 100644
--- a/po-windows-installer/ja.po
+++ b/po-windows-installer/ja.po
@@ -16,6 +16,7 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=1; plural=0;\n"
 
 #  InfoBefore page is used instead of license page because the GPL only
 #  concerns distribution, not use, and as such doesn't have to be accepted