diff --git a/src/libsodium/crypto_scalarmult/ed25519/ref10/scalarmult_ed25519_ref10.c b/src/libsodium/crypto_scalarmult/ed25519/ref10/scalarmult_ed25519_ref10.c
index bcbaefb9..ca77f799 100644
--- a/src/libsodium/crypto_scalarmult/ed25519/ref10/scalarmult_ed25519_ref10.c
+++ b/src/libsodium/crypto_scalarmult/ed25519/ref10/scalarmult_ed25519_ref10.c
@@ -69,7 +69,9 @@ crypto_scalarmult_ed25519_base(unsigned char *q,
     _crypto_scalarmult_ed25519_clamp(t);
     ge_scalarmult_base(&Q, t);
     ge_p3_tobytes(q, &Q);
-
+    if (sodium_is_zero(t, 32) != 0) {
+        return -1;
+    }
     return 0;
 }