diff --git a/system/ioport.c b/system/ioport.c
index 1a0e01fd06..0a1b80f299 100644
--- a/system/ioport.c
+++ b/system/ioport.c
@@ -230,9 +230,8 @@ static void portio_list_add_1(PortioList *piolist,
     mrpio = MEMORY_REGION_PORTIO_LIST(
                 object_new(TYPE_MEMORY_REGION_PORTIO_LIST));
     mrpio->portio_opaque = piolist->opaque;
-    mrpio->ports = g_malloc0(sizeof(MemoryRegionPortio) * (count + 1));
+    mrpio->ports = g_new0(MemoryRegionPortio, count + 1);
     memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
-    memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
 
     /* Adjust the offsets to all be zero-based for the region.  */
     for (i = 0; i < count; ++i) {