diff --git a/sys/sys/malloc.h b/sys/sys/malloc.h
index 19ae149e1b5..eab2cf2d211 100644
--- a/sys/sys/malloc.h
+++ b/sys/sys/malloc.h
@@ -35,6 +35,7 @@
 #ifndef _SYS_MALLOC_H_
 #define	_SYS_MALLOC_H_
 
+#include <sys/param.h>
 #include <sys/queue.h>
 #include <sys/_lock.h>
 #include <sys/_mutex.h>