diff --git a/4chan_x.coffee b/4chan_x.coffee
index 7ceb46af1..f98411309 100644
--- a/4chan_x.coffee
+++ b/4chan_x.coffee
@@ -369,10 +369,13 @@ iframeLoad = ->
     recaptchaReload()
 
 keyboardNav = (e) ->
-    char = String.fromCharCode e.keyCode
-    unless char in '1234567890GHJKLMOT'
+    kc = e.keyCode
+    #https://developer.mozilla.org/en/DOM/Event/UIEvent/KeyEvent
+    # [0-9;=A-Z]
+    unless 48 <= kc <= 90
         return
     e.preventDefault()
+    char = String.fromCharCode kc
     hash = location.hash
     if not hash or hash == '#navtop'
         position = 0
diff --git a/4chan_x.js b/4chan_x.js
index 83dfe3728..8df4aa550 100644
--- a/4chan_x.js
+++ b/4chan_x.js
@@ -456,12 +456,13 @@
     return recaptchaReload();
   };
   keyboardNav = function(e) {
-    var _i, _len, char, count, hash, href, img, position, qrLink, temp;
-    char = String.fromCharCode(e.keyCode);
-    if (!((function(){ for (var _i=0, _len='1234567890GHJKLMOT'.length; _i<_len; _i++) { if ('1234567890GHJKLMOT'[_i] === char) return true; } return false; }).call(this))) {
+    var _i, _len, char, count, hash, href, img, kc, position, qrLink, temp;
+    kc = e.keyCode;
+    if (!((48 <= kc) && (kc <= 90))) {
       return null;
     }
     e.preventDefault();
+    char = String.fromCharCode(kc);
     hash = location.hash;
     if (!hash || hash === '#navtop') {
       position = 0;