diff --git a/src/core/input/Keyboard.ts b/src/core/input/Keyboard.ts
index 9d86b349..4fea8adb 100644
--- a/src/core/input/Keyboard.ts
+++ b/src/core/input/Keyboard.ts
@@ -349,9 +349,8 @@ export function evaluateKeyboardEvent(
         if (ev.keyCode === 65) { // cmd + a
           result.type = KeyboardResultType.SELECT_ALL;
         }
-      } else if (ev.key && !ev.ctrlKey && !ev.altKey && !ev.metaKey &&
-          ev.keyCode >= 48 && ev.keyCode !== 144 && ev.keyCode !== 145) {
-        // Include only keys that that result in a character; don't include num lock and scroll lock
+      } else if (ev.key && !ev.ctrlKey && !ev.altKey && !ev.metaKey && ev.keyCode >= 48 && ev.key.length === 1) {
+        // Include only keys that that result in a _single_ character; don't include num lock, volume up, etc.
         result.key = ev.key;
       }
       break;