diff --git a/techlibs/machxo2/cells_sim.v b/techlibs/machxo2/cells_sim.v
index ef40f0231..1cb45650a 100644
--- a/techlibs/machxo2/cells_sim.v
+++ b/techlibs/machxo2/cells_sim.v
@@ -129,7 +129,7 @@ module FACADE_SLICE #(
 
 			wire k0;
 			wire k1;
-			PFUMX K0K1MUX (.ALUT(k1), .BLUT(k0), .C0(M0), .Z(OFX1));
+			PFUMX K0K1MUX (.ALUT(k1), .BLUT(k0), .C0(M0), .Z(OFX0));
 
 			LUT4 #(.INIT(LUT0_INITVAL)) LUT_0 (.A(A0), .B(B0), .C(C0), .D(D0), .Z(k0));
 			LUT4 #(.INIT(LUT0_INITVAL)) LUT_1 (.A(A0), .B(B0), .C(C0), .D(D0), .Z(k1));