diff --git a/rmw_zenoh_cpp/src/detail/zenoh_utils.cpp b/rmw_zenoh_cpp/src/detail/zenoh_utils.cpp
index 8145ef7c..5770718b 100644
--- a/rmw_zenoh_cpp/src/detail/zenoh_utils.cpp
+++ b/rmw_zenoh_cpp/src/detail/zenoh_utils.cpp
@@ -101,7 +101,7 @@ Payload::Payload(const zenoh::Bytes & bytes)
   }
 }
 
-const uint8_t * Payload::data()
+const uint8_t * Payload::data() const
 {
   if (std::holds_alternative<Empty>(bytes_)) {
     return nullptr;
@@ -112,7 +112,7 @@ const uint8_t * Payload::data()
   }
 }
 
-size_t Payload::size()
+size_t Payload::size() const
 {
   if (std::holds_alternative<Empty>(bytes_)) {
     return 0;
@@ -123,7 +123,7 @@ size_t Payload::size()
   }
 }
 
-bool Payload::empty()
+bool Payload::empty() const
 {
   return std::holds_alternative<Empty>(bytes_);
 }
diff --git a/rmw_zenoh_cpp/src/detail/zenoh_utils.hpp b/rmw_zenoh_cpp/src/detail/zenoh_utils.hpp
index 31a6d77c..dd7cff72 100644
--- a/rmw_zenoh_cpp/src/detail/zenoh_utils.hpp
+++ b/rmw_zenoh_cpp/src/detail/zenoh_utils.hpp
@@ -91,7 +91,7 @@ class Payload
   // Is `std::vector<uint8_t>` in case of a non-contiguous payload
   // and `zenoh::Slice` plus a `zenoh::Bytes` otherwise.
   std::variant<NonContiguous, Contiguous, Empty> bytes_;
-}
+};
 }  // namespace rmw_zenoh_cpp
 
 #endif  // DETAIL__ZENOH_UTILS_HPP_