diff --git a/pack-objects.c b/pack-objects.c
index f2a4338..fe2a4ea 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -49,7 +49,7 @@ static void rehash_objects(struct packing_data *pdata)
 		pdata->index_size = 1024;
 
 	free(pdata->index);
-	pdata->index = xcalloc(pdata->index_size, sizeof(*pdata->index));
+	CALLOC_ARRAY(pdata->index, pdata->index_size);
 
 	entry = pdata->objects;