diff --git a/src/requester-state.hpp b/src/requester-state.hpp
index 9ee0b53..9c14c1e 100644
--- a/src/requester-state.hpp
+++ b/src/requester-state.hpp
@@ -88,7 +88,7 @@
   /**
    * @brief AES key derived from the ecdh shared secret.
    */
-  uint8_t m_aesKey[16] = {0};
+  std::array<uint8_t, 16> m_aesKey = {0};
   /**
    * @brief The counter of AES blocks that have been encrypted.
    */