diff --git a/test/default/secretbox.c b/test/default/secretbox.c
index 6a06b297..c1492ebc 100644
--- a/test/default/secretbox.c
+++ b/test/default/secretbox.c
@@ -42,6 +42,15 @@ int main(void)
     }
     printf("\n");
 
+    memcpy(c, m, 163);
+    crypto_secretbox(c, c, 163, nonce, firstkey);
+    for (i = 16; i < 163; ++i) {
+        printf(",0x%02x", (unsigned int)c[i]);
+        if (i % 8 == 7)
+            printf("\n");
+    }
+    printf("\n");
+
     assert(crypto_secretbox_keybytes() > 0U);
     assert(crypto_secretbox_noncebytes() > 0U);
     assert(crypto_secretbox_zerobytes() > 0U);
diff --git a/test/default/secretbox.exp b/test/default/secretbox.exp
index 2b6c51ea..25db669b 100644
--- a/test/default/secretbox.exp
+++ b/test/default/secretbox.exp
@@ -17,3 +17,22 @@
 ,0x79,0x73,0xf6,0x22,0xa4,0x3d,0x14,0xa6
 ,0x59,0x9b,0x1f,0x65,0x4c,0xb4,0x5a,0x74
 ,0xe3,0x55,0xa5
+,0xf3,0xff,0xc7,0x70,0x3f,0x94,0x00,0xe5
+,0x2a,0x7d,0xfb,0x4b,0x3d,0x33,0x05,0xd9
+,0x8e,0x99,0x3b,0x9f,0x48,0x68,0x12,0x73
+,0xc2,0x96,0x50,0xba,0x32,0xfc,0x76,0xce
+,0x48,0x33,0x2e,0xa7,0x16,0x4d,0x96,0xa4
+,0x47,0x6f,0xb8,0xc5,0x31,0xa1,0x18,0x6a
+,0xc0,0xdf,0xc1,0x7c,0x98,0xdc,0xe8,0x7b
+,0x4d,0xa7,0xf0,0x11,0xec,0x48,0xc9,0x72
+,0x71,0xd2,0xc2,0x0f,0x9b,0x92,0x8f,0xe2
+,0x27,0x0d,0x6f,0xb8,0x63,0xd5,0x17,0x38
+,0xb4,0x8e,0xee,0xe3,0x14,0xa7,0xcc,0x8a
+,0xb9,0x32,0x16,0x45,0x48,0xe5,0x26,0xae
+,0x90,0x22,0x43,0x68,0x51,0x7a,0xcf,0xea
+,0xbd,0x6b,0xb3,0x73,0x2b,0xc0,0xe9,0xda
+,0x99,0x83,0x2b,0x61,0xca,0x01,0xb6,0xde
+,0x56,0x24,0x4a,0x9e,0x88,0xd5,0xf9,0xb3
+,0x79,0x73,0xf6,0x22,0xa4,0x3d,0x14,0xa6
+,0x59,0x9b,0x1f,0x65,0x4c,0xb4,0x5a,0x74
+,0xe3,0x55,0xa5