diff --git a/src/detail/blake2b.cpp b/src/detail/blake2b.cpp
index 9ce0c60..1e190b0 100644
--- a/src/detail/blake2b.cpp
+++ b/src/detail/blake2b.cpp
@@ -67,7 +67,7 @@ void compress(
     std::uint64_t offset_high, bool final_block) noexcept {
   std::array<std::uint64_t, 16> message{};
   for (std::size_t index = 0; index < message.size(); ++index) {
-    message[index] = load64(block.data() + index * sizeof(std::uint64_t));
+    message[index] = load64(&block[index * sizeof(std::uint64_t)]);
   }
 
   std::array<std::uint64_t, 16> value{};