diff --git a/activesupport/lib/active_support/core_ext/date_time/conversions.rb b/activesupport/lib/active_support/core_ext/date_time/conversions.rb
index 851012e3bf15f..d7b3ad7d8d1e6 100644
--- a/activesupport/lib/active_support/core_ext/date_time/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/conversions.rb
@@ -6,7 +6,7 @@
 class DateTime
   # Ruby 1.9 has DateTime#to_time which internally relies on Time. We define our own #to_time which allows
   # DateTimes outside the range of what can be created with Time.
-  remove_method :to_time if instance_methods.include?(:to_time)
+  remove_method :to_time
 
   # Convert to a formatted string. See Time::DATE_FORMATS for predefined formats.
   #