diff --git a/include/configs/IceCube.h b/include/configs/IceCube.h
index 0d38254..5988112 100644
--- a/include/configs/IceCube.h
+++ b/include/configs/IceCube.h
@@ -182,7 +182,7 @@
 
 #define OF_CPU			"PowerPC,5200@0"
 #define OF_SOC			"soc5200@f0000000"
-#define OF_TBCLK		(bd->bi_busfreq / 8)
+#define OF_TBCLK		(bd->bi_busfreq / 4)
 #define OF_STDOUT_PATH		"/soc5200@f0000000/serial@2000"
 
 /*