diff --git a/sys/dev/pst/pst-raid.c b/sys/dev/pst/pst-raid.c
index b369a6d36fdc..de152f611e3a 100644
--- a/sys/dev/pst/pst-raid.c
+++ b/sys/dev/pst/pst-raid.c
@@ -39,6 +39,7 @@
 #include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mutex.h>
+#include <sys/proc.h>
 #include <sys/rman.h>
 
 #include <vm/vm.h>