diff --git a/src/hb-blob.cc b/src/hb-blob.cc
index 58d73242c04e0953c07a467692713442b131d173..b2b1d9c61875b217fc66dda4f3458c7447519a20 100644
--- a/src/hb-blob.cc
+++ b/src/hb-blob.cc
@@ -64,8 +64,8 @@ static hb_blob_t _hb_blob_nil = {
 
   TRUE, /* immutable */
 
-  0, /* length */
   NULL, /* data */
+  0, /* length */
   HB_MEMORY_MODE_READONLY, /* mode */
 
   NULL, /* user_data */