diff --git a/ChangeLog b/ChangeLog
index 832e599368..c108a69d98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jul 14 00:10:15 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* array.c (rb_ary_pop): may cause realloc oscillation.  a patch
+	  from MORITA Naoyuki <mlgetter at kidou.sakura.ne.jp>.
+	  [ruby-dev:29028]
+
 Thu Jul 13 22:23:56 2006  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/lib/tk/composite.rb: improve handling of the classname on the 
diff --git a/array.c b/array.c
index 708a4900c0..5bf0e9979d 100644
--- a/array.c
+++ b/array.c
@@ -454,7 +454,7 @@ rb_ary_pop(VALUE ary)
     rb_ary_modify_check(ary);
     if (RARRAY(ary)->len == 0) return Qnil;
     if (!FL_TEST(ary, ELTS_SHARED) &&
-	    RARRAY(ary)->len * 2 < RARRAY(ary)->aux.capa &&
+	    RARRAY(ary)->len * 3 < RARRAY(ary)->aux.capa &&
 	    RARRAY(ary)->aux.capa > ARY_DEFAULT_SIZE) {
 	RARRAY(ary)->aux.capa = RARRAY(ary)->len * 2;
 	REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->aux.capa);