diff --git a/aucat/aucat.c b/aucat/aucat.c
index 308bcef..e0d6d5f 100644
--- a/aucat/aucat.c
+++ b/aucat/aucat.c
@@ -1393,7 +1393,7 @@ main(int argc, char **argv)
 		}
 		if (mode != (SIO_PLAY | SIO_REC)) {
 			log_puts("both -i and -o required\n");
-			return 0;
+			return 1;
 		}
 		if (!offline())
 			return 1;