diff --git a/src/sim/reader.c b/src/sim/reader.c
index b41b730..982b2ee 100644
--- a/src/sim/reader.c
+++ b/src/sim/reader.c
@@ -40,7 +40,7 @@
 {
 	int ret;
 
-	if (!msgb_apdu_de(resp) || msgb_apdu_le(resp) < 2)
+	if (!resp->l2h || msgb_apdu_le(resp) < 2)
 		return -EIO;
 
 	ret = msgb_get_u16(resp);