diff --git a/projects/mips_sys/sim/tb_mips_sys.fdo b/projects/mips_sys/sim/tb_mips_sys.fdo
index 2fd4ee3..bd0a098 100644
--- a/projects/mips_sys/sim/tb_mips_sys.fdo
+++ b/projects/mips_sys/sim/tb_mips_sys.fdo
@@ -6,6 +6,7 @@ if {[file exists work]} {vdel -lib work -all}
 vlib work
 
 # Configs
+vcom -explicit  -93 "../../../lib/SDRAM/ddr_sdr_v1_5/src/sdram_const.vhd"
 vcom -explicit  -93 "../src/sdram_config_sim.vhd"
 
 # Packages