diff --git a/ChangeLog b/ChangeLog
index 4142229875..6a907ce45f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon May 10 23:50:19 2010  Tanaka Akira  <akr@fsij.org>
+
+	* pack.c (pack_unpack): add a missing break.
+
 Mon May 10 14:13:04 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* time.c (rb_big_abs_find_minbit): get rid of a warning of VC.
diff --git a/pack.c b/pack.c
index 91f3eb5b2a..8c07522fdf 100644
--- a/pack.c
+++ b/pack.c
@@ -1723,6 +1723,7 @@ pack_unpack(VALUE str, VALUE fmt)
                 PACK_ITEM_ADJUST();
 		break;
 	    }
+            break;
 
 	  case 'f':
 	  case 'F':