diff --git a/rmw_zenoh_cpp/src/detail/rmw_data_types.hpp b/rmw_zenoh_cpp/src/detail/rmw_data_types.hpp
index 7a5be287..ee1adf73 100644
--- a/rmw_zenoh_cpp/src/detail/rmw_data_types.hpp
+++ b/rmw_zenoh_cpp/src/detail/rmw_data_types.hpp
@@ -218,7 +218,7 @@ class ZenohQuery final
   const z_loaned_query_t * get_query() const;
 
 private:
-  z_owned_query_t * query_;
+  z_owned_query_t * query_{nullptr};
 };
 
 ///=============================================================================