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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
index ecf5201d12..41d93c4322 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb
@@ -1,5 +1,7 @@
# frozen_string_literal: true
+require "concurrent/map"
+
module ActiveRecord
module ConnectionAdapters # :nodoc:
module QueryCache