diff --git a/app/scripts/comp/app/yubikey.js b/app/scripts/comp/app/yubikey.js
index da112e47..a86e916d 100644
--- a/app/scripts/comp/app/yubikey.js
+++ b/app/scripts/comp/app/yubikey.js
@@ -40,6 +40,7 @@ const YubiKey = {
         }
         return new Promise((resolve) => {
             this.ykmanStatus = 'checking';
+            this._cmd = undefined;
             Launcher.spawn({
                 cmd: this.cmd(),
                 args: ['-v'],