diff --git a/src/southbridge/nvidia/ck804/ck804_enable_rom.c b/src/southbridge/nvidia/ck804/ck804_enable_rom.c
index 070c09efe3..fa1c2e19fb 100644
--- a/src/southbridge/nvidia/ck804/ck804_enable_rom.c
+++ b/src/southbridge/nvidia/ck804/ck804_enable_rom.c
@@ -2,7 +2,11 @@
  * Copyright 2004 Tyan Computer
  *  by yhlu@tyan.com
  */
-
+#if HT_CHAIN_END_UNITID_BASE < HT_CHAIN_UNITID_BASE
+        #define CK804_DEVN_BASE HT_CHAIN_END_UNITID_BASE
+#else
+        #define CK804_DEVN_BASE HT_CHAIN_UNITID_BASE
+#endif
 
 static void ck804_enable_rom(void)
 {