diff --git a/lib/vtls/vtls.h b/lib/vtls/vtls.h
index 3516247301..8ad1cf6def 100644
--- a/lib/vtls/vtls.h
+++ b/lib/vtls/vtls.h
@@ -43,7 +43,7 @@ struct Curl_ssl_session;
 #define VTLS_INFOF_NO_ALPN                                      \
   "ALPN: server did not agree on a protocol. Uses default."
 #define VTLS_INFOF_ALPN_OFFER_1STR              \
-  "ALPN: offers %s"
+  "ALPN: curl offers %s"
 #define VTLS_INFOF_ALPN_ACCEPTED_1STR           \
   ALPN_ACCEPTED "%s"
 #define VTLS_INFOF_ALPN_ACCEPTED_LEN_1STR       \