diff --git a/src/hb-draw.h b/src/hb-draw.h
index 0dea7f7dd..956467462 100644
--- a/src/hb-draw.h
+++ b/src/hb-draw.h
@@ -47,6 +47,10 @@ typedef struct hb_draw_state_t {
   hb_var_num_t   reserved1;
   hb_var_num_t   reserved2;
   hb_var_num_t   reserved3;
+  hb_var_num_t   reserved4;
+  hb_var_num_t   reserved5;
+  hb_var_num_t   reserved6;
+  hb_var_num_t   reserved7;
 } hb_draw_state_t;
 
 #define HB_DRAW_STATE_DEFAULT {0, 0.f, 0.f, 0.f, 0.f, {0.}, {0.}, {0.}}