diff --git a/library/test/src/console.rs b/library/test/src/console.rs
index dc0123cf4326..e9dda98966de 100644
--- a/library/test/src/console.rs
+++ b/library/test/src/console.rs
@@ -137,7 +137,7 @@ fn current_test_count(&self) -> usize {
 // List the tests to console, and optionally to logfile. Filters are honored.
 pub fn list_tests_console(opts: &TestOpts, tests: Vec<TestDescAndFn>) -> io::Result<()> {
     let mut output = match term::stdout() {
-        None => OutputLocation::Raw(io::stdout()),
+        None => OutputLocation::Raw(io::stdout().lock()),
         Some(t) => OutputLocation::Pretty(t),
     };