diff --git a/des/sim/vhdl/makefile b/des/sim/vhdl/makefile
index c7d3fda..38f7eb1 100644
--- a/des/sim/vhdl/makefile
+++ b/des/sim/vhdl/makefile
@@ -30,7 +30,7 @@ tb_des.ghw : ../../rtl/vhdl/*.vhd tb_des.vhd
 	ghdl -r tb_des --wave=tb_des.ghw --assert-level=error --stop-time=11us
 
 wave : tb_des.ghw
-	gtkwave -T tb_des.tcl tb_des.ghw
+	gtkwave -S tb_des.tcl tb_des.ghw
 	
 clean :
 	echo "# cleaning simulation files"