diff --git a/src/js/game/key_action_mapper.js b/src/js/game/key_action_mapper.js
index ed681c90..872db1d2 100644
--- a/src/js/game/key_action_mapper.js
+++ b/src/js/game/key_action_mapper.js
@@ -262,7 +262,9 @@ export function getStringForKeyCode(code) {
             return "'";
     }
 
-    return 48 <= code && code <= 57 || 65 <= code && code <= 90 ? String.fromCharCode(code) : "[" + code + "]";
+    return (48 <= code && code <= 57) || (65 <= code && code <= 90)
+        ? String.fromCharCode(code)
+        : "[" + code + "]";
 }
 
 export class Keybinding {