diff --git a/lib/libfrr.h b/lib/libfrr.h
index f964c9e2a1..9d91ea9154 100644
--- a/lib/libfrr.h
+++ b/lib/libfrr.h
@@ -128,7 +128,8 @@ extern void frr_preinit(struct frr_daemon_info *daemon, int argc, char **argv);
 extern void frr_opt_add(const char *optstr, const struct option *longopts,
 			const char *helpstr);
 extern int frr_getopt(int argc, char *const argv[], int *longindex);
-extern void frr_help_exit(int status);
+
+extern __attribute__((__noreturn__)) void frr_help_exit(int status);
 
 extern struct thread_master *frr_init(void);
 extern const char *frr_get_progname(void);
diff --git a/lib/memory.h b/lib/memory.h
index 44ea19b557..e4e05faa4f 100644
--- a/lib/memory.h
+++ b/lib/memory.h
@@ -179,7 +179,8 @@ extern int qmem_walk(qmem_walk_fn *func, void *arg);
 extern int log_memstats(FILE *fp, const char *);
 #define log_memstats_stderr(prefix) log_memstats(stderr, prefix)
 
-extern void memory_oom(size_t size, const char *name);
+extern __attribute__((__noreturn__)) void memory_oom(size_t size,
+						     const char *name);
 
 #ifdef __cplusplus
 }
diff --git a/zebra/zserv.h b/zebra/zserv.h
index 6a075cc9a7..6ab7fbd918 100644
--- a/zebra/zserv.h
+++ b/zebra/zserv.h
@@ -314,7 +314,7 @@ extern void zserv_read_file(char *input);
 #endif
 
 /* TODO */
-int zebra_finalize(struct thread *event);
+__attribute__((__noreturn__)) int zebra_finalize(struct thread *event);
 
 /*
  * Graceful restart functions.