diff --git a/examples/kernel/memp_simple.c b/examples/kernel/memp_simple.c
index 4fc7d89f0f5280b2bc0180a1424a809b3592e281..b232de584752342cffe7181d65bf119c2e44ef5b 100644
--- a/examples/kernel/memp_simple.c
+++ b/examples/kernel/memp_simple.c
@@ -74,7 +74,7 @@ int mempool_simple_init()
 	for (i = 0; i < 48; i ++) ptr[i] = RT_NULL;
 
 	/* 初始化内存池对象 */
-	rt_mp_init(&mp, "mp1", &mempool[0], 80, sizeof(mempool));
+	rt_mp_init(&mp, "mp1", &mempool[0], sizeof(mempool), 80);
 
 	/* 创建线程1 */
 	tid1 = rt_thread_create("t1",