diff --git a/src/threads.h b/src/threads.h
index d89c7cd2a65e5943d6cce280385452ce6bdd2ed4..ab4a6a6c6a261a41800920207aa43cb2032af301 100644
--- a/src/threads.h
+++ b/src/threads.h
@@ -109,7 +109,7 @@ extern struct object *thread_id;
 
 #define th_setconcurrency(X) thr_setconcurrency(X)
 
-#define th_create(ID,fun,arg) thr_create(NULL,0,fun,arg,THR_DAEMON,ID)
+#define th_create(ID,fun,arg) thr_create(NULL,0,fun,arg,THR_DAEMON|THR_DETACHED,ID)
 #define th_exit(foo) thr_exit(foo)
 #define th_self() thr_self()
 #define th_yield() thr_yield()