diff --git a/ChangeLog b/ChangeLog
index a6dbcc3b7b..fc08a9ebbd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jul  7 12:05:37 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* cont.c (cont_free): remove mysterious fflush()
+	  introduced at r19890, maybe accidentaly.
+
 Tue Jul  7 11:45:14 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* proc.c (rb_method_call): because data->me should be non-NULL,
diff --git a/cont.c b/cont.c
index dc412ec46c..2ac2b3d997 100644
--- a/cont.c
+++ b/cont.c
@@ -226,7 +226,7 @@ cont_free(void *ptr)
     RUBY_FREE_ENTER("cont");
     if (ptr) {
 	rb_context_t *cont = ptr;
-	RUBY_FREE_UNLESS_NULL(cont->saved_thread.stack); fflush(stdout);
+	RUBY_FREE_UNLESS_NULL(cont->saved_thread.stack);
 #if FIBER_USE_NATIVE
 	if (cont->type == CONTINUATION_CONTEXT) {
 	    /* cont */