diff --git a/sys/dev/bktr/bktr_mem.c b/sys/dev/bktr/bktr_mem.c
index 507e70f28032..ae5968c14be1 100644
--- a/sys/dev/bktr/bktr_mem.c
+++ b/sys/dev/bktr/bktr_mem.c
@@ -48,6 +48,7 @@
 
 #include <sys/param.h>
 #include <sys/kernel.h>
+#include <sys/systm.h>
 #include <dev/bktr/bktr_mem.h>
 
 struct memory_pointers {