diff --git a/pkg/emscripten/libretro/index.html b/pkg/emscripten/libretro/index.html
index 7651ad525e..fea47989e0 100644
--- a/pkg/emscripten/libretro/index.html
+++ b/pkg/emscripten/libretro/index.html
@@ -86,7 +86,7 @@
                            <span class="fa fa-trash-o" id="icnClean"></span> <span class="sr-only">Cleanup</span>
                         </button>
                         <input class="btn btn-primary disabled" style="display: none" type="file" id="btnRom" name="upload" onclick="document.getElementById('btnAdd').click();" onchange="selectFiles(event.target.files)" multiple />
-                        <button class="btn btn-primary disabled tooltip-enable" id="btnMenu" onclick="keyPress(112);" title="Menu toggle" disabled>
+                        <button class="btn btn-primary disabled tooltip-enable" id="btnMenu" onclick="keyPress('F1');" title="Menu toggle" disabled>
                            <span class="fa fa-bars" id="btnMenu"></span> <span class="sr-only">Menu</span>
                         </button>
                         <button class="btn btn-primary disabled tooltip-enable" id="btnFullscreen" onclick="Module.requestFullScreen()" title="Fullscreen" disabled>
diff --git a/pkg/emscripten/libretro/libretro.js b/pkg/emscripten/libretro/libretro.js
index 300c6ff1bd..fa5c78f03c 100644
--- a/pkg/emscripten/libretro/libretro.js
+++ b/pkg/emscripten/libretro/libretro.js
@@ -393,31 +393,7 @@ function keyPress(k)
 }
 
 kp = function(k, event) {
-   var oEvent = document.createEvent('KeyboardEvent');
-
-   // Chromium Hack
-   Object.defineProperty(oEvent, 'keyCode', {
-      get : function() {
-         return this.keyCodeVal;
-      }
-   });
-   Object.defineProperty(oEvent, 'which', {
-      get : function() {
-         return this.keyCodeVal;
-      }
-   });
-
-   if (oEvent.initKeyboardEvent) {
-      oEvent.initKeyboardEvent(event, true, true, document.defaultView, false, false, false, false, k, k);
-   } else {
-      oEvent.initKeyEvent(event, true, true, document.defaultView, false, false, false, false, k, 0);
-   }
-
-   oEvent.keyCodeVal = k;
-
-   if (oEvent.keyCode !== k) {
-      alert("keyCode mismatch " + oEvent.keyCode + "(" + oEvent.which + ")");
-   }
+   var oEvent = new KeyboardEvent(event, { code: k });
 
    document.dispatchEvent(oEvent);
    document.getElementById('canvas').focus();