diff --git a/sys/sys/_cpuset.h b/sys/sys/_cpuset.h
--- a/sys/sys/_cpuset.h
+++ b/sys/sys/_cpuset.h
@@ -40,7 +40,7 @@
 #define	CPU_SETSIZE	MAXCPU
 #endif
 
-#define	CPU_MAXSIZE	256
+#define	CPU_MAXSIZE	1024
 
 #ifndef	CPU_SETSIZE
 #define	CPU_SETSIZE	CPU_MAXSIZE