diff --git a/ChangeLog b/ChangeLog
index ae6949f394..d448940704 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Mar 20 00:59:50 2010  wanabe  <s.wanabe@gmail.com>
+
+	* ext/dl/lib/dl/pack.rb (DL#pack): allow LLP64.
+
 Fri Mar 19 05:26:31 2010  Tanaka Akira  <akr@fsij.org>
 
 	* string.c (rb_str_sum): don't call method for each byte.
diff --git a/ext/dl/lib/dl/pack.rb b/ext/dl/lib/dl/pack.rb
index d760edaab5..7fbc802b0f 100644
--- a/ext/dl/lib/dl/pack.rb
+++ b/ext/dl/lib/dl/pack.rb
@@ -79,7 +79,7 @@ module DL
       case SIZEOF_VOIDP
       when SIZEOF_LONG
         ary.pack(@template)
-      when SIZEOF_LONG
+      when SIZEOF_LONG_LONG
         ary.pack(@template)
       else
         raise(RuntimeError, "sizeof(void*)?")