diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
index 640da68ce1..b2487101ed 100644
--- a/block/qcow2-bitmap.c
+++ b/block/qcow2-bitmap.c
@@ -753,7 +753,7 @@ static int bitmap_list_store(BlockDriverState *bs, Qcow2BitmapList *bm_list,
         dir_offset = *offset;
     }
 
-    dir = g_try_malloc(dir_size);
+    dir = g_try_malloc0(dir_size);
     if (dir == NULL) {
         return -ENOMEM;
     }