diff --git a/assets/js/markdowntoolbar.js b/assets/js/markdowntoolbar.js
index 534388f6..05c8eb8e 100644
--- a/assets/js/markdowntoolbar.js
+++ b/assets/js/markdowntoolbar.js
@@ -7,19 +7,19 @@ import { $, $$ } from './utils/dom';
 const markdownSyntax = {
   bold: {
     action: wrapSelection,
-    options: { prefix: '**', shortcutKey: 'b' },
+    options: { prefix: '**', shortcutKeyCode: 66 },
   },
   italics: {
     action: wrapSelection,
-    options: { prefix: '*', shortcutKey: 'i' },
+    options: { prefix: '*', shortcutKeyCode: 73 },
   },
   under: {
     action: wrapSelection,
-    options: { prefix: '__', shortcutKey: 'u' },
+    options: { prefix: '__', shortcutKeyCode: 85 },
   },
   spoiler: {
     action: wrapSelection,
-    options: { prefix: '||', shortcutKey: 's' },
+    options: { prefix: '||', shortcutKeyCode: 83 },
   },
   code: {
     action: wrapSelectionOrLines,
@@ -29,7 +29,7 @@ const markdownSyntax = {
       prefixMultiline: '```\n',
       suffixMultiline: '\n```',
       singleWrap: true,
-      shortcutKey: 'e',
+      shortcutKeyCode: 69,
     },
   },
   strike: {
@@ -50,11 +50,11 @@ const markdownSyntax = {
   },
   link: {
     action: insertLink,
-    options: { shortcutKey: 'l' },
+    options: { shortcutKeyCode: 76 },
   },
   image: {
     action: insertLink,
-    options: { image: true, shortcutKey: 'k' },
+    options: { image: true, shortcutKeyCode: 75 },
   },
   escape: {
     action: escapeSelection,
@@ -257,10 +257,10 @@ function shortcutHandler(event) {
   }
 
   const textarea = event.target,
-    key = event.key.toLowerCase();
+    keyCode = event.keyCode;
 
   for (const id in markdownSyntax) {
-    if (key === markdownSyntax[id].options.shortcutKey) {
+    if (keyCode === markdownSyntax[id].options.shortcutKeyCode) {
       markdownSyntax[id].action(textarea, markdownSyntax[id].options);
       event.preventDefault();
     }
diff --git a/assets/js/shortcuts.ts b/assets/js/shortcuts.ts
index 682863ef..3de21c89 100644
--- a/assets/js/shortcuts.ts
+++ b/assets/js/shortcuts.ts
@@ -4,7 +4,7 @@
 
 import { $ } from './utils/dom';
 
-type ShortcutKeyMap = Record<string, () => void>;
+type ShortcutKeyMap = Record<number, () => void>;
 
 function getHover(): string | null {
   const thumbBoxHover = $<HTMLDivElement>('.media-box:hover');
@@ -50,19 +50,19 @@ function isOK(event: KeyboardEvent): boolean {
 /* eslint-disable prettier/prettier */
 
 const keyCodes: ShortcutKeyMap = {
-  j() { click('.js-prev');             }, // J - go to previous image
-  i() { click('.js-up');               }, // I - go to index page
-  k() { click('.js-next');             }, // K - go to next image
-  r() { click('.js-rand');             }, // R - go to random image
-  s() { click('.js-source-link');      }, // S - go to image source
-  l() { click('.js-tag-sauce-toggle'); }, // L - edit tags
-  o() { openFullView();                }, // O - open original
-  v() { openFullViewNewTab();          }, // V - open original in a new tab
-  f() {
+  74() { click('.js-prev');             }, // J - go to previous image
+  73() { click('.js-up');               }, // I - go to index page
+  75() { click('.js-next');             }, // K - go to next image
+  82() { click('.js-rand');             }, // R - go to random image
+  83() { click('.js-source-link');      }, // S - go to image source
+  76() { click('.js-tag-sauce-toggle'); }, // L - edit tags
+  79() { openFullView();                }, // O - open original
+  86() { openFullViewNewTab();          }, // V - open original in a new tab
+  70() {
     // F - favourite image
     click(getHover() ? `a.interaction--fave[data-image-id="${getHover()}"]` : '.block__header a.interaction--fave');
   },
-  u() {
+  85() {
     // U - upvote image
     click(getHover() ? `a.interaction--upvote[data-image-id="${getHover()}"]` : '.block__header a.interaction--upvote');
   },
@@ -72,8 +72,8 @@ const keyCodes: ShortcutKeyMap = {
 
 export function listenForKeys() {
   document.addEventListener('keydown', (event: KeyboardEvent) => {
-    if (isOK(event) && keyCodes[event.key]) {
-      keyCodes[event.key]();
+    if (isOK(event) && keyCodes[event.keyCode]) {
+      keyCodes[event.keyCode]();
       event.preventDefault();
     }
   });