diff --git a/lib/Service/Totp.php b/lib/Service/Totp.php
index d59f12410..eef5ff6d4 100644
--- a/lib/Service/Totp.php
+++ b/lib/Service/Totp.php
@@ -72,7 +72,7 @@ public function hasSecret(IUser $user): bool {
 	}
 
 	private function generateSecret(): string {
-		return $this->random->generate(160, ISecureRandom::CHAR_UPPER.'234567');
+		return $this->random->generate(32, ISecureRandom::CHAR_UPPER.'234567');
 	}
 
 	/**