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-rw-r--r--library/test/src/console.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/test/src/console.rs b/library/test/src/console.rs
index dc0123cf432..e9dda98966d 100644
--- a/library/test/src/console.rs
+++ b/library/test/src/console.rs
@@ -137,7 +137,7 @@ impl ConsoleTestState {
 // 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),
     };