diff --git a/techlibs/quicklogic/qlf_k6n10f/cells_sim.v b/techlibs/quicklogic/qlf_k6n10f/cells_sim.v
index b9f406256..ddfd51ee7 100644
--- a/techlibs/quicklogic/qlf_k6n10f/cells_sim.v
+++ b/techlibs/quicklogic/qlf_k6n10f/cells_sim.v
@@ -121,7 +121,6 @@ module sh_dff(
 endmodule
 
 (* abc9_box, lib_whitebox *)
-(* blackbox *)
 (* keep *)
 module adder_carry(
 		output wire sumout,