diff --git a/src/northsouthbridge/sis/630/northbridge.c b/src/northsouthbridge/sis/630/northbridge.c
index 5fd7a8a38c..81e133a93f 100644
--- a/src/northsouthbridge/sis/630/northbridge.c
+++ b/src/northsouthbridge/sis/630/northbridge.c
@@ -126,8 +126,9 @@ void framebuffer_on()
 
 void copy_irq_routing_table(void)
 {
-#ifdef SIS630
+#ifdef USE_DOC_MIL
+	/* copy the PCI IRQ table to segment F, not neceressary for 512KB flash case */
 	memcpy((char *) RTABLE_DEST, &intel_irq_routing_table, intel_irq_routing_table.size);
-#endif
+#endif /* USE_DOC_MIL */
 }