diff --git a/test/default/box_easy2.c b/test/default/box_easy2.c
index 67478d52..710f997c 100644
--- a/test/default/box_easy2.c
+++ b/test/default/box_easy2.c
@@ -100,6 +100,9 @@ int main(void)
         printf("crypto_box_open_easy_afternm() with a huge ciphertext should have failed\n");
     }
     memset(m2, 0, m2_size);
+    ret = crypto_box_detached(c, mac, m, (unsigned long long) mlen,
+                              nonce, small_order_p, bobsk);
+    assert(ret == -1);
     ret = crypto_box_detached(c, mac, m, (unsigned long long) mlen,
                               nonce, alicepk, bobsk);
     assert(ret == 0);