diff --git a/projects/mips_sys/src/sdram_config.vhd b/projects/mips_sys/src/sdram_config.vhd
index 97a709f..7343731 100644
--- a/projects/mips_sys/src/sdram_config.vhd
+++ b/projects/mips_sys/src/sdram_config.vhd
@@ -25,6 +25,8 @@ library IEEE;
 USE IEEE.STD_LOGIC_1164.ALL;
 USE IEEE.NUMERIC_STD.ALL;
 
+use work.sdram_const.all;
+
 package sdram_config is
 
 	constant DATA_RATE_FACTOR		: positive := 2;	-- DDR => twice part data width
diff --git a/projects/mips_sys/src/sdram_config_sim.vhd b/projects/mips_sys/src/sdram_config_sim.vhd
index cf18d70..cd5d675 100644
--- a/projects/mips_sys/src/sdram_config_sim.vhd
+++ b/projects/mips_sys/src/sdram_config_sim.vhd
@@ -25,6 +25,8 @@ library IEEE;
 USE IEEE.STD_LOGIC_1164.ALL;
 USE IEEE.NUMERIC_STD.ALL;
 
+use work.sdram_const.all;
+
 package sdram_config is
 
 	constant DATA_RATE_FACTOR		: positive := 2;	-- DDR => twice part data width