diff --git a/library/util_tdd_sync/util_tdd_sync_constr.xdc b/library/util_tdd_sync/util_tdd_sync_constr.xdc
index 1685985a5..7414cec78 100644
--- a/library/util_tdd_sync/util_tdd_sync_constr.xdc
+++ b/library/util_tdd_sync/util_tdd_sync_constr.xdc
@@ -1,4 +1,6 @@
 
-set_false_path -to [get_cells -hier -filter {NAME =~ *sync_mode_d1* && IS_SEQUENTIAL}]
-set_false_path -from [get_cells -hier -filter {NAME =~ *sync_out_reg* && IS_SEQUENTIAL}]
+set_property ASYNC_REG TRUE \
+  [get_cells -hier *sync_mode_d*]
+
+set_false_path -to [get_cells -hier -filter {name =~ *sync_mode_d1*   && IS_SEQUENTIAL}]