diff --git a/blake2b.cpp b/blake2b.cpp
index 3c4011a..6c4998d 100644
--- a/blake2b.cpp
+++ b/blake2b.cpp
@@ -70,7 +70,7 @@ void blake2b_nativeIn(void *out, size_t outSize, const uint64_t *in, size_t inSi
  */
 void blake2b_nativeInOut(uint64_t out[8], const uint64_t *in, size_t inSize)
 {
-	uint8_t hash[8];
+	uint8_t hash[64];
 
 	// Hash
 	blake2b_nativeIn(hash, 64, in, inSize);