diff --git a/include/zenoh-pico/api/types.h b/include/zenoh-pico/api/types.h
index 1db2306c2..fef59ac5e 100644
--- a/include/zenoh-pico/api/types.h
+++ b/include/zenoh-pico/api/types.h
@@ -186,7 +186,7 @@ _Z_OWNED_TYPE_VALUE(_z_value_t, reply_err)
  *   (unstable) z_reliability_t reliability: The subscription reliability value.
  */
 typedef struct {
-#ifdef Z_FEATURE_UNSTABLE_API
+#if Z_FEATURE_UNSTABLE_API == 1
     z_reliability_t reliability;
 #else
     uint8_t __dummy;  // Just to avoid empty structures that might cause undefined behavior
diff --git a/include/zenoh-pico/config.h b/include/zenoh-pico/config.h
index de3cb138e..82b1b155b 100644
--- a/include/zenoh-pico/config.h
+++ b/include/zenoh-pico/config.h
@@ -21,6 +21,7 @@
 #define Z_BATCH_MULTICAST_SIZE 8096
 #define Z_CONFIG_SOCKET_TIMEOUT 100
 
+#define Z_FEATURE_UNSTABLE_API 0
 #define Z_FEATURE_MULTI_THREAD 1
 #define Z_FEATURE_PUBLICATION 1
 #define Z_FEATURE_SUBSCRIPTION 1
diff --git a/include/zenoh-pico/config.h.in b/include/zenoh-pico/config.h.in
index b4577f1fe..636fd822d 100644
--- a/include/zenoh-pico/config.h.in
+++ b/include/zenoh-pico/config.h.in
@@ -21,6 +21,7 @@
 #define Z_BATCH_MULTICAST_SIZE @BATCH_MULTICAST_SIZE@
 #define Z_CONFIG_SOCKET_TIMEOUT @Z_CONFIG_SOCKET_TIMEOUT@
 
+#define Z_FEATURE_UNSTABLE_API @Z_FEATURE_UNSTABLE_API@
 #define Z_FEATURE_MULTI_THREAD @Z_FEATURE_MULTI_THREAD@
 #define Z_FEATURE_PUBLICATION @Z_FEATURE_PUBLICATION@
 #define Z_FEATURE_SUBSCRIPTION @Z_FEATURE_SUBSCRIPTION@