diff --git a/invite.go b/invite.go
index 060947a..24e5fbe 100644
--- a/invite.go
+++ b/invite.go
@@ -350,8 +350,8 @@ func readCode(code string) (code_id string, code_pw string) {
 		}
 	}
 
-	id_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet ID"), 2, 64*1024, 4, 32)
-	pw_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet PW"), 2, 64*1024, 4, 32)
+	id_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet ID"), 3, 40*1024, 4, 32)
+	pw_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet PW"), 3, 40*1024, 4, 32)
 
 	code_id = hex.EncodeToString(id_hash[:8])
 	code_pw = hex.EncodeToString(pw_hash[:16])