diff --git a/src/hb-aat-layout-common.hh b/src/hb-aat-layout-common.hh
index 0b7ab48ff..9081de7dd 100644
--- a/src/hb-aat-layout-common.hh
+++ b/src/hb-aat-layout-common.hh
@@ -40,8 +40,6 @@ namespace AAT {
 
 using namespace OT;
 
-#define HB_AAT_BUFFER_DIGEST_THRESHOLD 32
-
 struct ankr;
 
 using hb_aat_class_cache_t = hb_cache_t<15, 8, 7>;