diff --git a/lib/active_record/connection_adapters/sqlserver/core_ext/explain_subscriber.rb b/lib/active_record/connection_adapters/sqlserver/core_ext/explain_subscriber.rb
index 349a40bd8..d96f8ac2c 100644
--- a/lib/active_record/connection_adapters/sqlserver/core_ext/explain_subscriber.rb
+++ b/lib/active_record/connection_adapters/sqlserver/core_ext/explain_subscriber.rb
@@ -1 +1,4 @@
-ActiveRecord::ExplainSubscriber::EXPLAINED_SQLS = /(select|update|delete|insert)\b/i
+silence_warnings do
+  # Already defined in Rails
+  ActiveRecord::ExplainSubscriber::EXPLAINED_SQLS = /(select|update|delete|insert)\b/i
+end