diff --git a/pkgs/applications/office/libreoffice/default.nix b/pkgs/applications/office/libreoffice/default.nix
index 9113eedc06c..e373377da05 100644
--- a/pkgs/applications/office/libreoffice/default.nix
+++ b/pkgs/applications/office/libreoffice/default.nix
@@ -13,7 +13,7 @@
 , librevenge, libe-book, libmwaw, glm, glew, gst_all_1
 , gdb, commonsLogging, librdf_rasqal, wrapGAppsHook
 , gnome3, glib, ncurses, epoxy, gpgme
-, langs ? [ "ca" "cs" "de" "en-GB" "en-US" "eo" "es" "fr" "hu" "it" "nl" "pl" "ru" "sl" "zh-CN" ]
+, langs ? [ "ca" "cs" "de" "en-GB" "en-US" "eo" "es" "fr" "hu" "it" "ja" "nl" "pl" "ru" "sl" "zh-CN" ]
 , withHelp ? true
 , kdeIntegration ? false
 }:
diff --git a/pkgs/applications/office/libreoffice/still.nix b/pkgs/applications/office/libreoffice/still.nix
index 1da6160e85b..1b7d2b0987f 100644
--- a/pkgs/applications/office/libreoffice/still.nix
+++ b/pkgs/applications/office/libreoffice/still.nix
@@ -13,7 +13,7 @@
 , librevenge, libe-book, libmwaw, glm, glew, gst_all_1
 , gdb, commonsLogging, librdf_rasqal, wrapGAppsHook
 , gnome3, glib, ncurses, epoxy, gpgme
-, langs ? [ "ca" "cs" "de" "en-GB" "en-US" "eo" "es" "fr" "hu" "it" "nl" "pl" "ru" "sl" "zh-CN" ]
+, langs ? [ "ca" "cs" "de" "en-GB" "en-US" "eo" "es" "fr" "hu" "it" "ja" "nl" "pl" "ru" "sl" "zh-CN" ]
 , withHelp ? true
 , kdeIntegration ? false
 }: