diff --git a/src/keys/drivers/YubiKeyStub.cpp b/src/keys/drivers/YubiKeyStub.cpp
index e93099bf4..15eef27ad 100644
--- a/src/keys/drivers/YubiKeyStub.cpp
+++ b/src/keys/drivers/YubiKeyStub.cpp
@@ -51,14 +51,14 @@ void YubiKey::detect()
 {
 }
 
-bool YubiKey::getSerial(unsigned int& serial) const
+bool YubiKey::getSerial(unsigned int& serial)
 {
     Q_UNUSED(serial);
 
     return false;
 }
 
-YubiKey::ChallengeResult YubiKey::challenge(int slot, bool mayBlock, const QByteArray& chal, QByteArray& resp) const
+YubiKey::ChallengeResult YubiKey::challenge(int slot, bool mayBlock, const QByteArray& chal, QByteArray& resp)
 {
     Q_UNUSED(slot);
     Q_UNUSED(mayBlock);