diff --git a/activemodel/lib/active_model/validations/exclusion.rb b/activemodel/lib/active_model/validations/exclusion.rb
index ab4de3c4599e3..d3b8d31502b13 100644
--- a/activemodel/lib/active_model/validations/exclusion.rb
+++ b/activemodel/lib/active_model/validations/exclusion.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/range.rb'
+require 'active_support/core_ext/range'
 
 module ActiveModel
 
diff --git a/activemodel/lib/active_model/validations/inclusion.rb b/activemodel/lib/active_model/validations/inclusion.rb
index bfb65d2f3fe10..9a9270d61503b 100644
--- a/activemodel/lib/active_model/validations/inclusion.rb
+++ b/activemodel/lib/active_model/validations/inclusion.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/range.rb'
+require 'active_support/core_ext/range'
 
 module ActiveModel