diff --git a/usr.bin/wall/wall.c b/usr.bin/wall/wall.c
index eea253f7509..c3aa323665e 100644
--- a/usr.bin/wall/wall.c
+++ b/usr.bin/wall/wall.c
@@ -68,14 +68,14 @@ static const char sccsid[] = "@(#)wall.c	8.2 (Berkeley) 11/16/93";
 static void makemsg(char *);
 static void usage(void);
 
-struct wallgroup {
+static struct wallgroup {
 	struct wallgroup *next;
 	char		*name;
 	gid_t		gid;
 } *grouplist;
-int nobanner;
-int mbufsize;
-char *mbuf;
+static int nobanner;
+static int mbufsize;
+static char *mbuf;
 
 static int
 ttystat(char *line)