diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index <HASH>..<HASH> 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -2,6 +2,7 @@ require 'date'
 require 'set'
 require 'bigdecimal'
 require 'bigdecimal/util'
+require 'active_support/core_ext/string/strip'
 
 module ActiveRecord
   module ConnectionAdapters #:nodoc:
Add missing AS require

`strip_heredoc` method is defined on active_support/core_ext/string