diff --git a/techlibs/greenpak4/cells_sim.v b/techlibs/greenpak4/cells_sim.v
index 586b7a9b8..1152ffe63 100644
--- a/techlibs/greenpak4/cells_sim.v
+++ b/techlibs/greenpak4/cells_sim.v
@@ -16,7 +16,6 @@ endmodule
 module GP_ACMP(input wire PWREN, input wire VIN, input wire VREF, output reg OUT);
 
 	parameter BANDWIDTH = "HIGH";
-	parameter VIN_BUF_EN = 0;
 	parameter VIN_ATTEN = 1;
 	parameter VIN_ISRC_EN = 0;
 	parameter HYSTERESIS = 0;