diff --git a/apps/locale/ChangeLog b/apps/locale/ChangeLog
index 3354a57c1..d21cb1a56 100644
--- a/apps/locale/ChangeLog
+++ b/apps/locale/ChangeLog
@@ -18,3 +18,4 @@
       Added Swedish localisation with English text
 0.16: Remove global variables that used RAM
       Add second 'dp' argument for decimal places in distance/speed/temp (fix #1523)
+0.17: Fix regression where long month names were 'undefined' (fix #1641)
diff --git a/apps/locale/locale.html b/apps/locale/locale.html
index b58b4a297..bac938ffa 100644
--- a/apps/locale/locale.html
+++ b/apps/locale/locale.html
@@ -161,7 +161,7 @@ exports = { name : "en_GB", currencySym:"£",
           "%A":  `${js(locale.day)}.split(',')[d.getDay()]`,
           "%a":  `${js(locale.abday)}.split(',')[d.getDay()]`,
           "%B":  `${js(locale.month)}.split(',')[d.getMonth()]`,
-          "%b":  `${js(locale.abmonth)}.split(',')[d.getMonth() + 12]`,
+          "%b":  `${js(locale.abmonth)}.split(',')[d.getMonth()]`,
           "%p":  `d.getHours()<12?${js(locale.ampm[0].toUpperCase())}:${js(locale.ampm[1].toUpperCase())}`,
           "%P":  `d.getHours()<12?${js(locale.ampm[0].toLowerCase())}:${js(locale.ampm[1].toLowerCase())}`
         };
diff --git a/apps/locale/metadata.json b/apps/locale/metadata.json
index 20f1f72b8..54ad64e80 100644
--- a/apps/locale/metadata.json
+++ b/apps/locale/metadata.json
@@ -1,7 +1,7 @@
 {
   "id": "locale",
   "name": "Languages",
-  "version": "0.16",
+  "version": "0.17",
   "description": "Translations for different countries",
   "icon": "locale.png",
   "type": "locale",