diff --git a/activesupport/test/core_ext/range_ext_test.rb b/activesupport/test/core_ext/range_ext_test.rb
index 854b0a38bd148..6d6afc85c49f4 100644
--- a/activesupport/test/core_ext/range_ext_test.rb
+++ b/activesupport/test/core_ext/range_ext_test.rb
@@ -42,7 +42,7 @@ def test_should_include_identical_exclusive
     assert((1...10).include?(1...10))
   end
 
-  def test_should_include_other_with_exlusive_end
+  def test_should_include_other_with_exclusive_end
     assert((1..10).include?(1...10))
   end