diff --git a/lib/liquid/range_lookup.rb b/lib/liquid/range_lookup.rb
index 8da022dc..93bb420c 100644
--- a/lib/liquid/range_lookup.rb
+++ b/lib/liquid/range_lookup.rb
@@ -16,9 +16,22 @@ module Liquid
     end
 
     def evaluate(context)
-      start_int = Utils.to_integer(context.evaluate(@start_obj))
-      end_int = Utils.to_integer(context.evaluate(@end_obj))
+      start_int = to_integer(context.evaluate(@start_obj))
+      end_int = to_integer(context.evaluate(@end_obj))
       start_int..end_int
     end
+
+    private
+
+    def to_integer(input)
+      case input
+      when Integer
+        input
+      when NilClass, String
+        input.to_i
+      else
+        Utils.to_integer(input)
+      end
+    end
   end
 end
diff --git a/test/integration/tags/for_tag_test.rb b/test/integration/tags/for_tag_test.rb
index fe2779fc..d9d396f3 100644
--- a/test/integration/tags/for_tag_test.rb
+++ b/test/integration/tags/for_tag_test.rb
@@ -42,6 +42,8 @@ HERE
     assert_raises(Liquid::ArgumentError) do
       Template.parse('{% for i in (a..2) %}{% endfor %}').render!("a" => [1, 2])
     end
+
+    assert_template_result(' 0  1  2  3 ', '{% for item in (a..3) %} {{item}} {% endfor %}', "a" => "invalid integer")
   end
 
   def test_for_with_variable_range