diff --git a/src/log.c b/src/log.c
index f9a4e26b26..e12a43b7f2 100644
--- a/src/log.c
+++ b/src/log.c
@@ -915,6 +915,13 @@ static int _postcheck_log_backend_compat(struct proxy *be)
 		free_stick_rules(&be->storersp_rules);
 		free_stick_rules(&be->sticking_rules);
 	}
+	if (isttest(be->server_id_hdr_name)) {
+		ha_warning("Cannot set \"server_id_hdr_name\" with 'mode log' in %s '%s'. It will be ignored.\n",
+			   proxy_type_str(be), be->id);
+
+		err_code |= ERR_WARN;
+		istfree(&be->server_id_hdr_name);
+	}
 	return err_code;
 }