diff --git a/lib/commands/execute.js b/lib/commands/execute.js
index 91ce471..375efa8 100644
--- a/lib/commands/execute.js
+++ b/lib/commands/execute.js
@@ -64,7 +64,7 @@ export async function executeMacosCommand (command, opts = {}) {
     throw new errors.UnknownCommandError(`Unknown extension command "${command}". ` +
       `Only ${_.keys(EXTENSION_COMMANDS_MAPPING)} commands are supported.`);
   }
-  return await this[EXTENSION_COMMANDS_MAPPING[command]](opts);
+  return await this[/** @type {string} */ (EXTENSION_COMMANDS_MAPPING[command])](opts);
 };
 
 /**