diff --git a/test/test_common/sha2.c b/test/test_common/sha2.c
index b04f59a2..41f3bb3f 100644
--- a/test/test_common/sha2.c
+++ b/test/test_common/sha2.c
@@ -7,6 +7,20 @@
 
 const unsigned char plaintext[113] = "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu";
 
+const unsigned char plaintext2[128] = {
+    0xfd, 0x22, 0x03, 0xe4, 0x67, 0x57, 0x4e, 0x83, 0x4a, 0xb0, 0x7c, 0x90,
+    0x97, 0xae, 0x16, 0x45, 0x32, 0xf2, 0x4b, 0xe1, 0xeb, 0x5d, 0x88, 0xf1,
+    0xaf, 0x77, 0x48, 0xce, 0xff, 0x0d, 0x2c, 0x67, 0xa2, 0x1f, 0x4e, 0x40,
+    0x97, 0xf9, 0xd3, 0xbb, 0x4e, 0x9f, 0xbf, 0x97, 0x18, 0x6e, 0x0d, 0xb6,
+    0xdb, 0x01, 0x00, 0x23, 0x0a, 0x52, 0xb4, 0x53, 0xd4, 0x21, 0xf8, 0xab,
+    0x9c, 0x9a, 0x60, 0x43, 0xaa, 0x32, 0x95, 0xea, 0x20, 0xd2, 0xf0, 0x6a,
+    0x2f, 0x37, 0x47, 0x0d, 0x8a, 0x99, 0x07, 0x5f, 0x1b, 0x8a, 0x83, 0x36,
+    0xf6, 0x22, 0x8c, 0xf0, 0x8b, 0x59, 0x42, 0xfc, 0x1f, 0xb4, 0x29, 0x9c,
+    0x7d, 0x24, 0x80, 0xe8, 0xe8, 0x2b, 0xce, 0x17, 0x55, 0x40, 0xbd, 0xfa,
+    0xd7, 0x75, 0x2b, 0xc9, 0x5b, 0x57, 0x7f, 0x22, 0x95, 0x15, 0x39, 0x4f,
+    0x3a, 0xe5, 0xce, 0xc8, 0x70, 0xa4, 0xb2, 0xf8
+};
+
 const unsigned char expected_224[28] = {
     0xc9, 0x7c, 0xa9, 0xa5, 0x59, 0x85, 0x0c, 0xe9, 0x7a, 0x04, 0xa9, 0x6d,
     0xef, 0x6d, 0x99, 0xa9, 0xe0, 0xe0, 0xe2, 0xab, 0x14, 0xe6, 0xb8, 0xdf,
@@ -34,6 +48,14 @@ const unsigned char expected_512[64] = {
     0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54, 0x5e, 0x96, 0xe5, 0x5b,
     0x87, 0x4b, 0xe9, 0x09
 };
+const unsigned char expected_512_2[64] = {
+    0xa2, 0x1b, 0x10, 0x77, 0xd5, 0x2b, 0x27, 0xac, 0x54, 0x5a, 0xf6, 0x3b,
+    0x32, 0x74, 0x6c, 0x6e, 0x3c, 0x51, 0xcb, 0x0c, 0xb9, 0xf2, 0x81, 0xeb,
+    0x9f, 0x35, 0x80, 0xa6, 0xd4, 0x99, 0x6d, 0x5c, 0x99, 0x17, 0xd2, 0xa6,
+    0xe4, 0x84, 0x62, 0x7a, 0x9d, 0x5a, 0x06, 0xfa, 0x1b, 0x25, 0x32, 0x7a,
+    0x9d, 0x71, 0x0e, 0x02, 0x73, 0x87, 0xfc, 0x3e, 0x07, 0xd7, 0xc4, 0xd1,
+    0x4c, 0x60, 0x86, 0xcc
+};
 
 static int test_sha256_incremental(void) {
     unsigned char output[32];
@@ -62,6 +84,31 @@ static int test_sha256_incremental(void) {
     return 0;
 }
 
+static int test_sha512_incremental(void) {
+    unsigned char output[64];
+    sha512ctx state;
+    int i = 0;
+
+    sha512_inc_init(&state);
+    sha512_inc_blocks(&state, plaintext2, 1);
+    sha512_inc_finalize(output, &state, NULL, 0);
+    if (memcmp(expected_512_2, output, 64) != 0) {
+        printf("ERROR sha512 incremental output did not match test vector.\n");
+        printf("Expected: ");
+        for (i = 0; i < 64; i++) {
+            printf("%02X", expected_512[i]);
+        }
+        printf("\n");
+        printf("Received: ");
+        for (i = 0; i < 64; i++) {
+            printf("%02X", output[i]);
+        }
+        printf("\n");
+        return 1;
+    }
+    return 0;
+}
+
 static int test_sha224(void) {
     unsigned char output[28];
     int i = 0;
@@ -165,6 +212,7 @@ int main(void) {
     result += test_sha256_incremental();
     result += test_sha384();
     result += test_sha512();
+    result += test_sha512_incremental();
 
     if (result != 0) {
         puts("Errors occurred");