diff --git a/include/kernel/mempool_heap.h b/include/kernel/mempool_heap.h
index df0e9fc8a83..d9126facc01 100644
--- a/include/kernel/mempool_heap.h
+++ b/include/kernel/mempool_heap.h
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 #ifndef ZEPHYR_INCLUDE_MEMPOOL_HEAP_H_
+#define ZEPHYR_INCLUDE_MEMPOOL_HEAP_H_
 
 /* Compatibility implementation of a k_mem_pool backend in terms of a
  * k_heap