diff --git a/tests/backend/test-threadpool.c b/tests/backend/test-threadpool.c
index 9541f7c43..c2167b314 100644
--- a/tests/backend/test-threadpool.c
+++ b/tests/backend/test-threadpool.c
@@ -118,7 +118,7 @@ TEST ("many-sleepy-threads")
 {
 
   const int threads_per_pool_count = 10;
-  unsigned int delay = 13;
+  unsigned int delay = 10000;
 
   lumiera_threadpool_init();
   LumieraThread threads[threads_per_pool_count*LUMIERA_THREADCLASS_COUNT];