diff --git a/ChangeLog b/ChangeLog
index 6376e196f2..1f96eb0264 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu May 22 17:18:35 2008  Tanaka Akira  <akr@fsij.org>
+
+	* array.c (rb_ary_compact_bang): fix reallocation size.
+
 Thu May 22 15:20:20 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* eval_intern.h, vm_core.h, include/ruby/intern.h, include/ruby/ruby.h,
diff --git a/array.c b/array.c
index 2cd3478edb..4cb74ac4f7 100644
--- a/array.c
+++ b/array.c
@@ -2715,7 +2715,7 @@ rb_ary_compact_bang(VALUE ary)
 	return Qnil;
     }
     if (n * 2 < ARY_CAPA(ary) && ARY_DEFAULT_SIZE * 2 < ARY_CAPA(ary)) {
-	RESIZE_CAPA(ary, ARY_DEFAULT_SIZE * 2);
+	RESIZE_CAPA(ary, n * 2);
     }
     RARRAY(ary)->len = n;