diff --git a/api/logic/minecraft/auth/MojangAccount.cpp b/api/logic/minecraft/auth/MojangAccount.cpp
index 2b073aac..e6247608 100644
--- a/api/logic/minecraft/auth/MojangAccount.cpp
+++ b/api/logic/minecraft/auth/MojangAccount.cpp
@@ -298,3 +298,9 @@ void MojangAccount::incrementUses()
 		qWarning() << "Account" << m_username << "is now in use.";
 	}
 }
+
+void MojangAccount::invalidateClientToken()
+{
+	m_clientToken = QUuid::createUuid().toString().remove(QRegExp("[{}-]"));
+	emit changed();
+}
diff --git a/api/logic/minecraft/auth/MojangAccount.h b/api/logic/minecraft/auth/MojangAccount.h
index 4902ec11..86d81c63 100644
--- a/api/logic/minecraft/auth/MojangAccount.h
+++ b/api/logic/minecraft/auth/MojangAccount.h
@@ -95,8 +95,8 @@ public: /* manipulation */
 	 * Attempt to login. Empty password means we use the token.
 	 * If the attempt fails because we already are performing some task, it returns false.
 	 */
-	std::shared_ptr<YggdrasilTask> login(AuthSessionPtr session,
-										 QString password = QString());
+	std::shared_ptr<YggdrasilTask> login(AuthSessionPtr session, QString password = QString());
+	void invalidateClientToken();
 
 public: /* queries */
 	const QString &username() const
diff --git a/application/LaunchController.cpp b/application/LaunchController.cpp
index 62e582d8..e8f369be 100644
--- a/application/LaunchController.cpp
+++ b/application/LaunchController.cpp
@@ -108,6 +108,7 @@ void LaunchController::login()
 				auto failReasonNew = task->failReason();
 				if(failReasonNew == "Invalid token.")
 				{
+					account->invalidateClientToken();
 					failReason = needLoginAgain;
 				}
 				else failReason = failReasonNew;