diff --git a/crypto_sign.js b/crypto_sign.js
index 30886e4..bc782b6 100644
--- a/crypto_sign.js
+++ b/crypto_sign.js
@@ -145,6 +145,8 @@ function crypto_sign_keypair (pk, sk, seeded) {
   pack(pk, p)
 
   for (i = 0; i < 32; i++) sk[i + 32] = pk[i]
+
+  return 0
 }
 
 function crypto_sign_seed_keypair (pk, sk, seed) {