diff --git a/prog/dump/i2cset.c b/prog/dump/i2cset.c
index b1a05fbc..8dfa3412 100644
--- a/prog/dump/i2cset.c
+++ b/prog/dump/i2cset.c
@@ -26,6 +26,8 @@
 #include <fcntl.h>
 #include "i2c-dev.h"
 
+void help(void) __attribute__ ((noreturn));
+
 void help(void)
 {
   FILE *fptr;