diff --git a/ChangeLog b/ChangeLog
index d0fbcd7d86..e5ddf9ca2c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Oct 22 17:46:27 2011  Tanaka Akira  <akr@fsij.org>
+
+	* lib/resolv.rb: fix a exception name in previous patch.
+
 Sat Oct 22 17:43:33 2011  Tanaka Akira  <akr@fsij.org>
 
 	* lib/resolv.rb: make timeout configurable for DNS query.
diff --git a/lib/resolv.rb b/lib/resolv.rb
index 89094a0ebf..6b4e06ad9d 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -874,7 +874,7 @@ class Resolv
           values = Array(values)
           values.each do |t|
             Numeric === t or raise ArgumentError, "#{t.inspect} is not numeric"
-            t > 0.0 or raise Argument, "timeout=#{t} must be postive"
+            t > 0.0 or raise ArgumentError, "timeout=#{t} must be postive"
           end
           @timeouts = values
         else