diff --git a/test/mem_pool.c b/test/mem_pool.c
index 85a56169e..8b6ea40d9 100644
--- a/test/mem_pool.c
+++ b/test/mem_pool.c
@@ -44,6 +44,8 @@ int test_mem_pool(void)
 	TEST_ASSERT(!mem_pool_borrow(pool));
 
 	e = mem_pool_release(pool, e);
+	TEST_ASSERT(!e);
+
 	e = mem_pool_borrow(pool);
 	TEST_ASSERT(e);
 
@@ -51,6 +53,7 @@ int test_mem_pool(void)
 
 	err = mem_pool_extend(pool, 1);
 	TEST_ERR(err);
+
 	e = mem_pool_borrow(pool);
 	TEST_ASSERT(e);