diff --git a/libbb/procps.c b/libbb/procps.c
index 44103fae8..fbb05532a 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -16,6 +16,10 @@
 
 #include "libbb.h"
 
+#ifndef
+#define PAGE_MASK		(~((getpagesize())-1))
+#endif
+
 extern procps_status_t * procps_scan(int save_user_arg0
 #ifdef CONFIG_SELINUX
 	, int use_selinux , security_id_t *sid