diff --git a/actionview/lib/action_view/renderer/partial_renderer.rb b/actionview/lib/action_view/renderer/partial_renderer.rb
index 514804b08e941149cdc126e35fdcc5d9aca8aa87..f15d6c965ea91f610b016b77caba3ec2062fb76a 100644
--- a/actionview/lib/action_view/renderer/partial_renderer.rb
+++ b/actionview/lib/action_view/renderer/partial_renderer.rb
@@ -521,7 +521,7 @@ def retrieve_template_keys
     def retrieve_variable(path, as)
       variable = as || begin
         base = path[-1] == "/".freeze ? "".freeze : File.basename(path)
-        raise_invalid_identifier(path) unless base =~ /\A_?(.*)(?:\.\w+)*\z/
+        raise_invalid_identifier(path) unless base =~ /\A_?(.*?)(\.\w+)*\z/
         $1.to_sym
       end
       if @collection
diff --git a/actionview/test/fixtures/test/_customer.mobile.erb b/actionview/test/fixtures/test/_customer.mobile.erb
new file mode 100644
index 0000000000000000000000000000000000000000..d8220afeda5ada8067479793a8b48503483d084d
--- /dev/null
+++ b/actionview/test/fixtures/test/_customer.mobile.erb
@@ -0,0 +1 @@
+Hello: <%= customer.name rescue "Anonymous" %>
\ No newline at end of file
diff --git a/actionview/test/template/render_test.rb b/actionview/test/template/render_test.rb
index 3561114d90d423e6ea9d361984a5715b5525f509..b417d1ebfa6f52171cafa629c13338436472a0e1 100644
--- a/actionview/test/template/render_test.rb
+++ b/actionview/test/template/render_test.rb
@@ -270,6 +270,11 @@ def test_render_partial_collection
     assert_equal "Hello: davidHello: mary", @view.render(:partial => "test/customer", :collection => [ Customer.new("david"), Customer.new("mary") ])
   end
 
+  def test_render_partial_collection_with_partial_name_containing_dot
+    assert_equal "Hello: davidHello: mary",
+      @view.render(:partial => "test/customer.mobile", :collection => [ Customer.new("david"), Customer.new("mary") ])
+  end
+
   def test_render_partial_collection_as_by_string
     assert_equal "david david davidmary mary mary",
       @view.render(:partial => "test/customer_with_var", :collection => [ Customer.new("david"), Customer.new("mary") ], :as => 'customer')