diff --git a/tests/flags.rs b/tests/flags.rs
index c244df17..53d84a22 100644
--- a/tests/flags.rs
+++ b/tests/flags.rs
@@ -114,7 +114,7 @@ fn verbose_mode() {
     // initialise it with Some(sender) only on threads spawned within
     // our test.
     thread_local! {
-        static VERBOSE_LOGS: RefCell<Option<Sender<String>>> = RefCell::new(None);
+        static VERBOSE_LOGS: RefCell<Option<Sender<String>>> = const { RefCell::new(None) };
     }
 
     struct LogTester;