diff --git a/sys/sys/_cpuset.h b/sys/sys/_cpuset.h
--- a/sys/sys/_cpuset.h
+++ b/sys/sys/_cpuset.h
@@ -35,6 +35,8 @@
 #include <sys/_bitset.h>
 
 #ifdef _KERNEL
+#include <machine/param.h>
+
 #define	CPU_SETSIZE	MAXCPU
 #endif
 
diff --git a/sys/sys/_domainset.h b/sys/sys/_domainset.h
--- a/sys/sys/_domainset.h
+++ b/sys/sys/_domainset.h
@@ -32,6 +32,8 @@
 #include <sys/_bitset.h>
 
 #ifdef _KERNEL
+#include <machine/param.h>
+
 #define	DOMAINSET_SETSIZE	MAXMEMDOM
 #endif