diff --git a/ChangeLog b/ChangeLog
index c7cdc8d6ef..7fe479ef34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun May 10 11:23:03 2015  Masaki Matsushita <glass.saga@gmail.com>
+
+	* enum.c (enum_to_a): Use size to set array capa when possible.
+	  the patch is from HonoreDB <aweiner at mdsol.com>.
+	  [fix GH-444]
+
 Sat May  9 06:48:36 2015  Eric Wong  <e@80x24.org>
 
 	* ext/socket/ancdata.c (bsock_recvmsg_internal): GC guard
diff --git a/enum.c b/enum.c
index a49e4b0b74..ea151b464d 100644
--- a/enum.c
+++ b/enum.c
@@ -515,7 +515,14 @@ enum_flat_map(VALUE obj)
 static VALUE
 enum_to_a(int argc, VALUE *argv, VALUE obj)
 {
-    VALUE ary = rb_ary_new();
+    VALUE ary, size = rb_check_funcall(obj, id_size, 0, 0);
+
+    if (NIL_P(size) || size == Qundef) {
+	ary = rb_ary_new();
+    }
+    else {
+	ary = rb_ary_new_capa(NUM2LONG(size));
+    }
 
     rb_block_call(obj, id_each, argc, argv, collect_all, ary);
     OBJ_INFECT(ary, obj);