diff --git a/crypto/newhope/newhope_test.c b/crypto/newhope/newhope_test.c
index cb0fcca0..ff6aa83a 100644
--- a/crypto/newhope/newhope_test.c
+++ b/crypto/newhope/newhope_test.c
@@ -77,8 +77,8 @@ static int test_invalid_sk_a() {
       return 0;
     }
 
-    /* Overwrite the secret key */
-    newhope_poly_getnoise(sk);
+    /* Corrupt the secret key */
+    NEWHOPE_keygen(servermsg /* not used below */, sk);
 
     /* Alice uses Bob's response to get her secret key */
     if (!NEWHOPE_server_compute_key(server_key, sk, clientmsg,