diff --git a/servers/ipc/sem.c b/servers/ipc/sem.c
index 965b560d5..5eaf59e7b 100644
--- a/servers/ipc/sem.c
+++ b/servers/ipc/sem.c
@@ -1,5 +1,7 @@
 #define __USE_MISC
 
+#include <minix/vm.h>
+
 #include "inc.h"
 
 struct waiting {