diff --git a/rtl/VX_define.v b/rtl/VX_define.v
index 76b28823..826567a3 100644
--- a/rtl/VX_define.v
+++ b/rtl/VX_define.v
@@ -9,7 +9,7 @@
 // Uncomment the below line if NW=1
 // `define ONLY
 
-// `define SYN 1
+`define SYN 1
 
 `define CACHE_NUM_BANKS 8