diff --git a/sys/alpha/alpha/dec_kn300.c b/sys/alpha/alpha/dec_kn300.c
index 4f1a21bda63..052d565eeb8 100644
--- a/sys/alpha/alpha/dec_kn300.c
+++ b/sys/alpha/alpha/dec_kn300.c
@@ -73,12 +73,8 @@ const struct alpha_variation_table dec_kn300_variations[] = {
 };
 
 
-#if NSC > 0
 extern int siocnattach __P((int, int));
-#endif
-#ifdef	DDB
 extern int siogdbattach __P((int, int));
-#endif
 extern int sccnattach __P((void));
 
 void