lib/kdf: Convert &vec[0] to vec.data()

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/kdf/hkdf/hkdf.cpp b/src/lib/kdf/hkdf/hkdf.cpp
index e725c3a4a..b643db6d9 100644
--- a/src/lib/kdf/hkdf/hkdf.cpp
+++ b/src/lib/kdf/hkdf/hkdf.cpp
@@ -41,7 +41,7 @@ size_t HKDF::kdf(byte out[], size_t out_len,
       m_prf->final(h);
 
       const size_t written = std::min(h.size(), out_len - offset);
-      copy_mem(&out[offset], &h[0], written);
+      copy_mem(&out[offset], h.data(), written);
       offset += written;
       }