diff --git a/fexc.c b/fexc.c
index 15aba3d..5e715d7 100644
--- a/fexc.c
+++ b/fexc.c
@@ -310,6 +310,7 @@ show_usage:
 	switch (argc - optind) {
 	case 2:
 		filename[1] = argv[optind+1]; /* out */
+		/* fall-through */
 	case 1:
 		if (strcmp(argv[optind], "-") != 0)
 			filename[0] = argv[optind]; /* in */
diff --git a/pio.c b/pio.c
index 0e6afd0..09cfaf8 100644
--- a/pio.c
+++ b/pio.c
@@ -165,7 +165,7 @@ static void print(const char *buf)
 
 static const char *argv0;
 
-static void usage(int rc )
+static __attribute__((noreturn)) void usage(int rc )
 {
 	fputs("sunxi-pio " VERSION "\n\n", stderr);
 	fprintf(stderr, "usage: %s -m|-i input [-o output] pin..\n", argv0);