diff --git a/telnet-client.c b/telnet-client.c
index 54d4e6b..42a5ba5 100644
--- a/telnet-client.c
+++ b/telnet-client.c
@@ -92,7 +92,7 @@
 	switch (ev->type) {
 	/* data received */
 	case TELNET_EV_DATA:
-		printf("%.*s", ev->size, ev->buffer);
+		printf("%.*s", (int)ev->size, ev->buffer);
 		break;
 	/* data must be sent */
 	case TELNET_EV_SEND: