diff --git a/components/bt/esp_ble_mesh/mesh_common/include/mesh_util.h b/components/bt/esp_ble_mesh/mesh_common/include/mesh_util.h
index 2690adde7c..8696d4a5c2 100644
--- a/components/bt/esp_ble_mesh/mesh_common/include/mesh_util.h
+++ b/components/bt/esp_ble_mesh/mesh_common/include/mesh_util.h
@@ -57,9 +57,7 @@ extern "C" {
  * an array (e.g. pointer)
  */
 #ifndef ARRAY_SIZE
-#define ARRAY_SIZE(array) \
-        ((unsigned long) (IS_ARRAY(array) + \
-            (sizeof(array) / sizeof((array)[0]))))
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
 #endif
 
 /* Evaluates to 1 if ptr is part of array, 0 otherwise; compile error if