diff --git a/libpurple/plugins/ssl/ssl-nss.c b/libpurple/plugins/ssl/ssl-nss.c
index f98ba13..6a0125f 100644
--- a/libpurple/plugins/ssl/ssl-nss.c
+++ b/libpurple/plugins/ssl/ssl-nss.c
@@ -474,6 +474,7 @@ ssl_nss_connect(PurpleSslConnection *gsc)
 
 	SSL_OptionSet(nss_data->in, SSL_SECURITY,            PR_TRUE);
 	SSL_OptionSet(nss_data->in, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+	SSL_OptionSet(nss_data->in, SSL_ENABLE_TLS13_COMPAT_MODE, PR_TRUE);
 
 	/* If we have our internal verifier set up, use it. Otherwise,
 	 * use default. */