diff --git a/src/libsodium/include/sodium/crypto_generichash_blake2b.h b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
index bd67b4f6..269c9b64 100644
--- a/src/libsodium/include/sodium/crypto_generichash_blake2b.h
+++ b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
@@ -6,9 +6,9 @@
 
 #include "export.h"
 
-#define crypto_generichash_blake2b_BYTES_MIN      1U
+#define crypto_generichash_blake2b_BYTES_MIN     16U
 #define crypto_generichash_blake2b_BYTES_MAX     64U
-#define crypto_generichash_blake2b_KEYBYTES_MIN   0U
+#define crypto_generichash_blake2b_KEYBYTES_MIN  16U
 #define crypto_generichash_blake2b_KEYBYTES_MAX  64U
 #define crypto_generichash_blake2b_BLOCKBYTES   128U