diff --git a/src/hashes/blake2s.c b/src/hashes/blake2s.c
index a33c639..61e421d 100644
--- a/src/hashes/blake2s.c
+++ b/src/hashes/blake2s.c
@@ -348,6 +348,11 @@ int blake2s_256_test(void)
         0xe1, 0x11, 0x21, 0xd0, 0x42, 0x35, 0x4a, 0x7c,
         0x1f, 0x55, 0xb6, 0x48, 0x2c, 0xa1, 0xa5, 0x1e,
         0x1b, 0x25, 0x0d, 0xfd, 0x1e, 0xd0, 0xee, 0xf9 } },
+    { "abc",
+      { 0x50, 0x8c, 0x5e, 0x8c, 0x32, 0x7c, 0x14, 0xe2,
+        0xe1, 0xa7, 0x2b, 0xa3, 0x4e, 0xeb, 0x45, 0x2f,
+        0x37, 0x45, 0x8b, 0x20, 0x9e, 0xd6, 0x3a, 0x29,
+        0x4d, 0x99, 0x9b, 0x4c, 0x86, 0x67, 0x59, 0x82 } },
 
     { NULL, { 0 } }
   };
@@ -386,6 +391,11 @@ int blake2s_224_test(void)
         0xb3, 0x43, 0x34, 0x75, 0xb2, 0xa0, 0xdd, 0x63,
         0xd5, 0x4a, 0x11, 0xec, 0xc4, 0xe3, 0xe0, 0x34,
         0xe7, 0xbc, 0x1e, 0xf4 } },
+    { "abc",
+      { 0x0b, 0x03, 0x3f, 0xc2, 0x26, 0xdf, 0x7a, 0xbd,
+        0xe2, 0x9f, 0x67, 0xa0, 0x5d, 0x3d, 0xc6, 0x2c,
+        0xf2, 0x71, 0xef, 0x3d, 0xfe, 0xa4, 0xd3, 0x87,
+        0x40, 0x7f, 0xbd, 0x55 } },
 
     { NULL, { 0 } }
   };
@@ -423,6 +433,10 @@ int blake2s_160_test(void)
       { 0x35, 0x4c, 0x9c, 0x33, 0xf7, 0x35, 0x96, 0x24,
         0x18, 0xbd, 0xac, 0xb9, 0x47, 0x98, 0x73, 0x42,
         0x9c, 0x34, 0x91, 0x6f} },
+    { "abc",
+      { 0x5a, 0xe3, 0xb9, 0x9b, 0xe2, 0x9b, 0x01, 0x83,
+        0x4c, 0x3b, 0x50, 0x85, 0x21, 0xed, 0xe6, 0x04,
+        0x38, 0xf8, 0xde, 0x17 } },
 
     { NULL, { 0 } }
   };
@@ -459,6 +473,9 @@ int blake2s_128_test(void)
     { "",
       { 0x64, 0x55, 0x0d, 0x6f, 0xfe, 0x2c, 0x0a, 0x01,
         0xa1, 0x4a, 0xba, 0x1e, 0xad, 0xe0, 0x20, 0x0c } },
+    { "abc",
+      { 0xaa, 0x49, 0x38, 0x11, 0x9b, 0x1d, 0xc7, 0xb8,
+        0x7c, 0xba, 0xd0, 0xff, 0xd2, 0x00, 0xd0, 0xae } },
 
     { NULL, { 0 } }
   };