diff --git a/btrfs-map-logical.c b/btrfs-map-logical.c
index 9d049955..7a8bcff9 100644
--- a/btrfs-map-logical.c
+++ b/btrfs-map-logical.c
@@ -190,7 +190,7 @@ static int write_extent_content(struct btrfs_fs_info *fs_info, int out_fd,
 	return ret;
 }
 
-static void print_usage(void) __attribute__((noreturn));
+__attribute__((noreturn))
 static void print_usage(void)
 {
 	printf("usage: btrfs-map-logical [options] device\n");
diff --git a/help.c b/help.c
index 19b0d357..99097db8 100644
--- a/help.c
+++ b/help.c
@@ -218,6 +218,7 @@ void usage_command(const struct cmd_struct *cmd, int full, int err)
 	usage_command_usagestr(cmd->usagestr, cmd->token, full, err);
 }
 
+__attribute__((noreturn))
 void usage(const char * const *usagestr)
 {
 	usage_command_usagestr(usagestr, NULL, 1, 1);
@@ -325,6 +326,7 @@ void usage_command_group(const struct cmd_group *grp, int full, int err)
 		fprintf(outf, "%s\n", grp->infostr);
 }
 
+__attribute__((noreturn))
 void help_unknown_token(const char *arg, const struct cmd_group *grp)
 {
 	fprintf(stderr, "%s: unknown token '%s'\n", get_argv0_buf(), arg);
@@ -332,6 +334,7 @@ void help_unknown_token(const char *arg, const struct cmd_group *grp)
 	exit(1);
 }
 
+__attribute__((noreturn))
 void help_ambiguous_token(const char *arg, const struct cmd_group *grp)
 {
 	const struct cmd_struct *cmd = grp->commands;
diff --git a/help.h b/help.h
index 7458e745..efeded30 100644
--- a/help.h
+++ b/help.h
@@ -55,13 +55,16 @@
 struct cmd_struct;
 struct cmd_group;
 
-void usage(const char * const *usagestr) __attribute__((noreturn));
+__attribute__((noreturn))
+void usage(const char * const *usagestr);
 void usage_command(const struct cmd_struct *cmd, int full, int err);
 void usage_command_group(const struct cmd_group *grp, int all, int err);
 void usage_command_group_short(const struct cmd_group *grp);
 
-void help_unknown_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
-void help_ambiguous_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
+__attribute__((noreturn))
+void help_unknown_token(const char *arg, const struct cmd_group *grp);
+__attribute__((noreturn))
+void help_ambiguous_token(const char *arg, const struct cmd_group *grp);
 
 void help_command_group(const struct cmd_group *grp, int argc, char **argv);