diff --git a/syn/vivado/taxi_sync_signal.tcl b/syn/vivado/taxi_sync_signal.tcl
new file mode 100644
index 0000000..176852a
--- /dev/null
+++ b/syn/vivado/taxi_sync_signal.tcl
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: CERN-OHL-S-2.0
+#
+# Copyright (c) 2020-2025 FPGA Ninja, LLC
+#
+# Authors:
+# - Alex Forencich
+#
+
+# signal synchronizer timing constraints
+
+foreach inst [get_cells -hier -filter {(ORIG_REF_NAME == taxi_sync_signal || REF_NAME == taxi_sync_signal)}] {
+    puts "Inserting timing constraints for taxi_sync_signal instance $inst"
+
+    set_property ASYNC_REG TRUE [get_cells -hier "sync_reg_reg[*][*]" -filter "PARENT == $inst"]
+    set_false_path -to [get_cells -hier "sync_reg_reg[0][*]" -filter "PARENT == $inst"]
+}