diff --git a/include/hb_detail.h b/include/hb_detail.h
index 172ecbc573c123c29753af802fe0bf23b2a2e13b..67c03e3c3c3fd4ba96e4db415a3a362efdc7b57b 100644
--- a/include/hb_detail.h
+++ b/include/hb_detail.h
@@ -846,7 +846,6 @@ case 0x ## t: \
 				//define_case(A9) TODO
 				define_ResponseType_case(AB)
 
-#undef define_ResponseType_case
 
 			case 0xA2: // EB BA 3F PN P0 A2 [Z, P]xN P1 SUM
 					{