diff --git a/src/hb-object.hh b/src/hb-object.hh
index e2c2c3394..5cffe1666 100644
--- a/src/hb-object.hh
+++ b/src/hb-object.hh
@@ -325,7 +325,7 @@ retry:
   hb_user_data_array_t *user_data = obj->header.user_data.get_acquire ();
   if (unlikely (!user_data))
   {
-    user_data = (hb_user_data_array_t *) hb_calloc (sizeof (hb_user_data_array_t), 1);
+    user_data = (hb_user_data_array_t *) hb_calloc (1, sizeof (hb_user_data_array_t));
     if (unlikely (!user_data))
       return false;
     user_data->init ();
diff --git a/src/hb-ot-cff1-table.hh b/src/hb-ot-cff1-table.hh
index 73aee6929..1bbd46384 100644
--- a/src/hb-ot-cff1-table.hh
+++ b/src/hb-ot-cff1-table.hh
@@ -1416,7 +1416,7 @@ struct cff1
       hb_sorted_vector_t<gname_t> *names = glyph_names.get_acquire ();
       if (unlikely (!names))
       {
-	names = (hb_sorted_vector_t<gname_t> *) hb_calloc (sizeof (hb_sorted_vector_t<gname_t>), 1);
+	names = (hb_sorted_vector_t<gname_t> *) hb_calloc (1, sizeof (hb_sorted_vector_t<gname_t>));
 	if (likely (names))
 	{
 	  names->init ();