diff --git a/ChangeLog b/ChangeLog
index 902e9a0db0..cf4d308b44 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jul 17 09:59:14 2015  Eric Wong  <e@80x24.org>
+
+	* thread.c (rb_thread_alone): simplify
+
 Fri Jul 17 09:58:32 2015  Eric Wong  <e@80x24.org>
 
 	* lib/rinda/tuplespace.rb: remove enumerator require
diff --git a/thread.c b/thread.c
index 69cd673674..1b726687a0 100644
--- a/thread.c
+++ b/thread.c
@@ -3048,12 +3048,7 @@ vm_living_thread_num(rb_vm_t *vm)
 int
 rb_thread_alone(void)
 {
-    int num = 1;
-    if (!list_empty(&GET_THREAD()->vm->living_threads)) {
-	num = vm_living_thread_num(GET_THREAD()->vm);
-	thread_debug("rb_thread_alone: %d\n", num);
-    }
-    return num == 1;
+    return vm_living_thread_num(GET_VM()) == 1;
 }
 
 /*