diff --git a/lib/liquid/drop.rb b/lib/liquid/drop.rb
index 1901871..db507eb 100644
--- a/lib/liquid/drop.rb
+++ b/lib/liquid/drop.rb
@@ -28,11 +28,11 @@ module Liquid
     end
 
     # called by liquid to invoke a drop
-    def invoke_drop(method)
-      if self.class.public_method_defined?(method)
-        send(method)
+    def invoke_drop(method_or_key)
+      if self.class.public_method_defined?(method_or_key.to_s.to_sym)
+        send(method_or_key.to_s.to_sym)
       else
-        before_method(method)
+        before_method(method_or_key)
       end
     end
 
diff --git a/test/lib/liquid/drop_test.rb b/test/lib/liquid/drop_test.rb
index 303d14a..4d74a1d 100644
--- a/test/lib/liquid/drop_test.rb
+++ b/test/lib/liquid/drop_test.rb
@@ -36,7 +36,7 @@ class ProductDrop < Liquid::Drop
 
   class CatchallDrop < Liquid::Drop
     def before_method(method)
-      return 'method: ' << method
+      return 'method: ' << method.to_s
     end
   end
 
@@ -88,12 +88,17 @@ class DropsTest < Test::Unit::TestCase
 
   end
 
-  def test_text_drop
+  def test_unknown_method
     output = Liquid::Template.parse( ' {{ product.catchall.unknown }} '  ).render('product' => ProductDrop.new)
     assert_equal ' method: unknown ', output
 
   end
 
+  def test_integer_argument_drop
+    output = Liquid::Template.parse( ' {{ product.catchall[8] }} '  ).render('product' => ProductDrop.new)
+    assert_equal ' method: 8 ', output
+  end
+
   def test_text_array_drop
     output = Liquid::Template.parse( '{% for text in product.texts.array %} {{text}} {% endfor %}'  ).render('product' => ProductDrop.new)
     assert_equal ' text1  text2 ', output