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@@ -1875,7 +1875,7 @@ module ActiveRecord
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                           jt_sti_extra = " AND %s.%s = %s" % [
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                             connection.quote_table_name(aliased_join_table_name),
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                             connection.quote_column_name(through_reflection.active_record.inheritance_column),
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-                            through_reflection.klass.quote_value(through_reflection.klass.name.demodulize)]
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+                            through_reflection.klass.quote_value(through_reflection.klass.sti_name)]
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                         end
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                       when :belongs_to
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                         first_key = primary_key
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@@ -1943,7 +1943,7 @@ module ActiveRecord
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               join << %(AND %s.%s = %s ) % [
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                 connection.quote_table_name(aliased_table_name),
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                 connection.quote_column_name(klass.inheritance_column),
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-                klass.quote_value(klass.name.demodulize)] unless klass.descends_from_active_record?
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+                klass.quote_value(klass.sti_name)] unless klass.descends_from_active_record?
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               [through_reflection, reflection].each do |ref|
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                 join << "AND #{interpolate_sql(sanitize_sql(ref.options[:conditions]))} " if ref && ref.options[:conditions]

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@@ -995,4 +995,22 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
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     assert firm.clients.loaded?
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   end
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+  def test_joins_with_namespaced_model_should_use_correct_type
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+    old = ActiveRecord::Base.store_full_sti_class
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+    ActiveRecord::Base.store_full_sti_class = true
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+
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+    firm = Namespaced::Firm.create({ :name => 'Some Company' })
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+    firm.clients.create({ :name => 'Some Client' })
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+
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+    stats = Namespaced::Firm.find(firm.id, {
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+      :select => "#{Namespaced::Firm.table_name}.*, COUNT(#{Namespaced::Client.table_name}.id) AS num_clients",
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+      :joins  => :clients,
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+      :group  => "#{Namespaced::Firm.table_name}.id"
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+    })
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+    assert_equal 1, stats.num_clients.to_i
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+
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+  ensure
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+    ActiveRecord::Base.store_full_sti_class = old
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+  end
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+
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 end

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@@ -18,6 +18,13 @@ end
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 module Namespaced
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   class Company < ::Company
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   end
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+
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+  class Firm < ::Company
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+    has_many :clients, :class_name => 'Namespaced::Client'
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+  end
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+
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+  class Client < ::Company
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+  end
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 end
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 class Firm < Company