diff --git a/src/backend.c b/src/backend.c
index 4d47c94..d431920 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -1412,8 +1412,8 @@
 		srv_conn->ctx = srv_cs;
 #if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
 		if (!srv ||
-		    ((!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
-		    srv->mux_proto || s->be->mode != PR_MODE_HTTP))
+		    (srv->use_ssl != 1 || (!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
+		     srv->mux_proto || s->be->mode != PR_MODE_HTTP))
 #endif
 			init_mux = 1;