diff --git a/tests/30backend-threadpool.tests b/tests/30backend-threadpool.tests
index 3e13cd3e9..9d53a9b80 100644
--- a/tests/30backend-threadpool.tests
+++ b/tests/30backend-threadpool.tests
@@ -36,6 +36,9 @@ err: result is 0
 err: value is 84
 END
 
+TEST "joinable thread" joinable-thread <<END
+END
+
 TEST "sync joinable" sync-joinable <<END
 err: syncing with the master thread
 err: the master thread received its arguments
diff --git a/tests/backend/test-threadpool.c b/tests/backend/test-threadpool.c
index 12146c519..5931d51a7 100644
--- a/tests/backend/test-threadpool.c
+++ b/tests/backend/test-threadpool.c
@@ -309,6 +309,20 @@ TEST ("sync-many")
   lumiera_threadpool_destroy ();
 }
 
+TEST ("joinable-thread")
+{
+  int delay = 10000;
+  lumiera_threadpool_init ();
+  LumieraThread t = lumiera_thread_run (LUMIERA_THREADCLASS_IDLE
+					     | LUMIERA_THREAD_JOINABLE,
+					     &sleep_fn,
+					     (void *)&delay,
+					     "joinable idle thread",
+					     &NOBUG_FLAG (test));
+  lumiera_thread_join(t);
+  lumiera_threadpool_destroy ();
+}
+
 TEST ("sync-joinable")
 {
   lumiera_threadpool_init ();