diff --git a/lib/cm3/vector.c b/lib/cm3/vector.c
index 13d8f6ac..97217787 100644
--- a/lib/cm3/vector.c
+++ b/lib/cm3/vector.c
@@ -32,7 +32,7 @@ extern funcp_t __preinit_array_start, __preinit_array_end;
 extern funcp_t __init_array_start, __init_array_end;
 extern funcp_t __fini_array_start, __fini_array_end;
 
-void main(void);
+int main(void);
 void blocking_handler(void);
 void null_handler(void);
 
@@ -90,7 +90,7 @@ void __attribute__ ((weak, naked)) reset_handler(void)
 	}
 
 	/* Call the application's entry point. */
-	main();
+	(void)main();
 
 	/* Destructors. */
 	for (fp = &__fini_array_start; fp < &__fini_array_end; fp++) {