diff --git a/techlibs/greenpak4/cells_sim.v b/techlibs/greenpak4/cells_sim.v
index 5a59a06b4..b9cfbe665 100644
--- a/techlibs/greenpak4/cells_sim.v
+++ b/techlibs/greenpak4/cells_sim.v
@@ -286,7 +286,7 @@ module GP_SHREG(input nRST, input CLK, input IN, output OUTA, output OUTB);
 	
 	reg[15:0] shreg = 0;
 	
-	always @(posedge clk, negedge nRST) begin
+	always @(posedge CLK, negedge nRST) begin
 		
 		if(!nRST)
 			shreg = 0;