diff --git a/ykval-db.sql b/ykval-db.sql
index 13cda3a..f78752a 100644
--- a/ykval-db.sql
+++ b/ykval-db.sql
@@ -18,7 +18,7 @@ CREATE TABLE yubikeys (
   yk_use INT NOT NULL,
   yk_low INT NOT NULL,
   yk_high INT NOT NULL,
-  nonce VARCHAR(32) DEFAULT '',
+  nonce VARCHAR(40) DEFAULT '',
   notes VARCHAR(100) DEFAULT '',
   PRIMARY KEY (yk_publicname)
 );