diff --git a/src/libsodium/crypto_sign/ed25519/ref10/sign.c b/src/libsodium/crypto_sign/ed25519/ref10/sign.c
index 6ea94fff..61354684 100644
--- a/src/libsodium/crypto_sign/ed25519/ref10/sign.c
+++ b/src/libsodium/crypto_sign/ed25519/ref10/sign.c
@@ -64,6 +64,7 @@ _crypto_sign_ed25519_detached(unsigned char *sig, unsigned long long *siglen_p,
     sc_muladd(sig + 32, hram, az, nonce);
 
     sodium_memzero(az, sizeof az);
+    sodium_memzero(nonce, sizeof nonce);
 
     if (siglen_p != NULL) {
         *siglen_p = 64U;