diff --git a/projects/mips_sys/ise92/mips_sys/ucf/systest.ucf b/projects/mips_sys/ise92/mips_sys/ucf/systest.ucf
index 7c2ae63..3777342 100644
--- a/projects/mips_sys/ise92/mips_sys/ucf/systest.ucf
+++ b/projects/mips_sys/ise92/mips_sys/ucf/systest.ucf
@@ -243,6 +243,8 @@ NET sys_sdr_data<*>	FAST;
 
 #NET "sys_sdr_data<*>" OFFSET=OUT 2.5 ns BEFORE "sys_sdr_clk_n";
 
+NET "sys_sdr_clk_p" TNM_NET = "ddr_clk_p";
+NET "sys_sdr_clk_n" TNM_NET = "ddr_clk_n";
 
 # Timing Constraint for DDR Feedback Clock
 NET sys_sdr_clk_fb FEEDBACK = 1 ns NET sys_sdr_clk_p;