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-rw-r--r--activerecord/lib/active_record/migration.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 05568039d8..627e93b5b6 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -1,4 +1,5 @@
require "set"
+require "zlib"
require "active_support/core_ext/module/attribute_accessors"
require "active_support/core_ext/regexp"