diff --git a/include/core/sha3.h b/include/core/sha3.h
index 2fbc551..fd3f9ff 100644
--- a/include/core/sha3.h
+++ b/include/core/sha3.h
@@ -37,7 +37,7 @@ extern "C" {
 #endif
 
 #ifndef SHA3_HASH_SIZE_BYTES
-#define SHA3_HASH_SIZE_BYTES(bits) ((bits) / sizeof(u8))
+#define SHA3_HASH_SIZE_BYTES(bits) ((bits) / 8)
 #endif
 
 #ifndef SHA3_BLOCK_SIZE