diff --git a/skeletons/converter-sample.c b/skeletons/converter-sample.c
index c0fc2fb8..2f74a800 100644
--- a/skeletons/converter-sample.c
+++ b/skeletons/converter-sample.c
@@ -788,7 +788,7 @@ static int argument_is_stdin(char *av[], int idx) {
 static FILE *argument_to_file(char *av[], int idx) {
 	return argument_is_stdin(av, idx)
 		? stdin
-		: fopen(av[idx], "r");
+		: fopen(av[idx], "rb");
 }
 
 static char *argument_to_name(char *av[], int idx) {