diff --git a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
index 991df7f..fa1d706 100644
--- a/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
+++ b/projects/mips_sys/ise101/mips_sys/ucf/systest.ucf
@@ -28,7 +28,7 @@ TIMESPEC "TS_sdram_clk" = PERIOD "sdram_clk" 7.5 ns HIGH 50 %;
 TIMESPEC "TS_unrelate_SDRAM" = FROM sys_clk TO sdram_clk TIG;
 
 NET "vga_clk" TNM_NET = "vga_clk";
-TIMESPEC "TS_vga_clk" = PERIOD "vga_clk" 7.5 ns HIGH 50 %;
+TIMESPEC "TS_vga_clk" = PERIOD "vga_clk" 8.0 ns HIGH 50 %;
 TIMESPEC "TS_unrelate_VGA" = FROM sys_clk TO vga_clk TIG;
 
 NET "sys_clk_in" LOC = "AE14";