diff --git a/tests/gui/runner.rs b/tests/gui/runner.rs
index ff808a72c5..c59deee0b6 100644
--- a/tests/gui/runner.rs
+++ b/tests/gui/runner.rs
@@ -75,6 +75,7 @@ fn main() {
     let mut command = Command::new("npx");
     command
         .arg("browser-ui-test")
+	.args(["--debug", "--jobs", "1"])
         .args(["--variable", "DOC_PATH", book_dir.as_str()])
         .args(["--test-folder", "tests/gui"]);
     if std::env::args().any(|arg| arg == "--disable-headless-test") {