added timescale for cells_sim
diff --git a/ql-qlf-plugin/qlf_k6n10f/cells_sim.v b/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
index 0818d36..d2fc0a7 100644
--- a/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
+++ b/ql-qlf-plugin/qlf_k6n10f/cells_sim.v
@@ -14,6 +14,8 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
+`timescale 1ps/1ps
+
 `default_nettype none
 
 (* abc9_flop, lib_whitebox *)