diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG
index 95962f74b6..78bb94d60a 100644
--- a/activerecord/CHANGELOG
+++ b/activerecord/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that the dynamic finder like find_all_by_something_boolean(false) didn't work #649 [lmarlow@yahoo.com]
+
 * Added validates_each that validates each specified attribute against a block #610 [bitsweat]. Example:
     
     class Person < ActiveRecord::Base
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index a79d75bba3..226db25ea3 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -755,7 +755,7 @@ module ActiveRecord #:nodoc:
             attributes.each { |attr_name| super unless column_methods_hash[attr_name.intern] }
 
             attr_index = -1
-            conditions = attributes.collect { |attr_name| attr_index += 1; "#{attr_name} #{arguments[attr_index] ? "=" : "IS"} ? " }.join(" AND ")
+            conditions = attributes.collect { |attr_name| attr_index += 1; "#{attr_name} #{arguments[attr_index].nil? ? "IS" : "="} ? " }.join(" AND ")
             send(finder, [conditions, *arguments[0...attributes.length]], *arguments[attributes.length..-1])
           else
             super
diff --git a/activerecord/test/finder_test.rb b/activerecord/test/finder_test.rb
index 1f6a58dee6..30b0b78313 100755
--- a/activerecord/test/finder_test.rb
+++ b/activerecord/test/finder_test.rb
@@ -199,6 +199,16 @@ class FinderTest < Test::Unit::TestCase
 
     assert_equal [], Topic.find_all_by_title("The First Topic!!")
   end
+
+  def test_find_all_by_boolean_attribute
+    topics = Topic.find_all_by_approved(false)
+    assert_equal 1, topics.size
+    assert topics.include?(@topics["first"].find)
+
+    topics = Topic.find_all_by_approved(true)
+    assert_equal 1, topics.size
+    assert topics.include?(@topics["second"].find)
+  end
   
   def test_find_by_nil_attribute
     topic = Topic.find_by_last_read nil