diff --git a/include/zenohcxx/api.hxx b/include/zenohcxx/api.hxx
index f81efaba..d4e60a2b 100644
--- a/include/zenohcxx/api.hxx
+++ b/include/zenohcxx/api.hxx
@@ -1758,7 +1758,7 @@ class Subscriber : public Owned<::z_owned_subscriber_t> {
 #ifdef __ZENOHCXX_ZENOHC
     /// @brief Get the key expression of the subscriber
     /// @return ``zenoh::KeyExpr`` value
-    z::KeyExpr get_keyexpr() const;
+    z::KeyExpr get_keyexpr() const { return ::z_subscriber_keyexpr(loan()); }
 #endif
 };
 
@@ -1843,7 +1843,7 @@ class Publisher : public Owned<::z_owned_publisher_t> {
 #ifdef __ZENOHCXX_ZENOHC
     /// @brief Get the key expression of the publisher
     /// @return ``zenoh::KeyExpr`` value
-    z::KeyExpr get_keyexpr() const;
+    z::KeyExpr get_keyexpr() const { return ::z_publisher_keyexpr(loan()); }
 #endif
 
 #ifdef __ZENOHCXX_ZENOHC
diff --git a/include/zenohcxx/impl.hxx b/include/zenohcxx/impl.hxx
index 0d5a8dee..8cf09f07 100644
--- a/include/zenohcxx/impl.hxx
+++ b/include/zenohcxx/impl.hxx
@@ -313,14 +313,6 @@ inline bool z::Publisher::put_owned_impl(z::Payload&& payload, const z::Publishe
 
 #endif
 
-#ifdef __ZENOHCXX_ZENOHC
-z::KeyExpr z::Publisher::get_keyexpr() const { return ::z_publisher_keyexpr(loan()); }
-#endif
-
-#ifdef __ZENOHCXX_ZENOHC
-z::KeyExpr z::Subscriber::get_keyexpr() const { return ::z_subscriber_keyexpr(loan()); }
-#endif
-
 inline bool scout(z::ScoutingConfig&& config, ClosureHello&& callback, ErrNo& error) {
     auto c = config.take();
     auto cb = callback.take();