diff --git a/lib/emac/src/tb_emac_top_jb.vhd b/lib/emac/src/tb_emac_top_jb.vhd
index d4ffe91..2dd10a9 100644
--- a/lib/emac/src/tb_emac_top_jb.vhd
+++ b/lib/emac/src/tb_emac_top_jb.vhd
@@ -32,7 +32,7 @@ END tb_emac_top_jb;
 ARCHITECTURE behavior OF tb_emac_top_jb IS 
 
 	constant CLK_PERIOD		: time := 10 ns;
-	constant MII_CLK_PERIOD	: time := 40 ns;
+	constant MII_CLK_PERIOD	: time := 40.7 ns;
 
 	signal CLK				: std_logic := '1';
 	signal RST				: std_logic := '1';