diff --git a/libexec/atrun/atrun.c b/libexec/atrun/atrun.c
index 78d4ab32157..e9e49146ba7 100644
--- a/libexec/atrun/atrun.c
+++ b/libexec/atrun/atrun.c
@@ -96,7 +96,7 @@ static int debug = 0;
 
 void perr(const char *fmt, ...);
 void perrx(const char *fmt, ...);
-static void usage(void);
+static void usage(void) __dead2;
 
 /* Local functions */
 static int
diff --git a/libexec/bootpd/bootpgw/bootpgw.c b/libexec/bootpd/bootpgw/bootpgw.c
index c0042ccb1de..1aab5e7f6f5 100644
--- a/libexec/bootpd/bootpgw/bootpgw.c
+++ b/libexec/bootpd/bootpgw/bootpgw.c
@@ -84,7 +84,7 @@ __FBSDID("$FreeBSD$");
  * Externals, forward declarations, and global variables
  */
 
-static void usage(void);
+static void usage(void) __dead2;
 static void handle_reply(void);
 static void handle_request(void);
 
diff --git a/libexec/bootpd/tools/bootpef/bootpef.c b/libexec/bootpd/tools/bootpef/bootpef.c
index 2fb928f3065..51e5e581f7d 100644
--- a/libexec/bootpd/tools/bootpef/bootpef.c
+++ b/libexec/bootpd/tools/bootpef/bootpef.c
@@ -78,7 +78,7 @@ SOFTWARE.
  */
 
 static void mktagfile(struct host *);
-static void usage(void);
+static void usage(void) __dead2;
 
 /*
  * General
diff --git a/libexec/rbootd/rbootd.c b/libexec/rbootd/rbootd.c
index 9e1c8e0bda7..6afceae050a 100644
--- a/libexec/rbootd/rbootd.c
+++ b/libexec/rbootd/rbootd.c
@@ -70,7 +70,7 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include "defs.h"
 
-static void usage(void);
+static void usage(void) __dead2;
 
 int
 main(int argc, char *argv[])
diff --git a/libexec/rpc.rwalld/rwalld.c b/libexec/rpc.rwalld/rwalld.c
index adde226cfba..d1167219bd2 100644
--- a/libexec/rpc.rwalld/rwalld.c
+++ b/libexec/rpc.rwalld/rwalld.c
@@ -56,7 +56,7 @@ __FBSDID("$FreeBSD$");
 void wallprog_1(struct svc_req *rqstp, SVCXPRT *transp);
 void possess(void);
 void killkids(int sig);
-static void usage(void);
+static void usage(void) __dead2;
 
 int nodaemon = 0;
 int from_inetd = 1;