diff --git a/lib/buildkite/test_collector.rb b/lib/buildkite/test_collector.rb
index 97e1df4..4f10b3a 100644
--- a/lib/buildkite/test_collector.rb
+++ b/lib/buildkite/test_collector.rb
@@ -12,8 +12,6 @@ module TestCollector
 require "timeout"
 require "tmpdir"
 
-require "active_support/notifications"
-
 require_relative "test_collector/version"
 require_relative "test_collector/error"
 require_relative "test_collector/ci"
@@ -70,6 +68,10 @@ def self.enable_tracing!
       Buildkite::TestCollector::Network.configure
       Buildkite::TestCollector::Object.configure
 
+      return unless defined?(ActiveSupport)
+
+      require "active_support/notifications"
+
       ActiveSupport::Notifications.subscribe("sql.active_record") do |name, start, finish, id, payload|
         Buildkite::TestCollector::Uploader.tracer&.backfill(:sql, finish - start, **{ query: payload[:sql] })
       end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index aae93ad..69fa230 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "buildkite/test_collector"
+require "active_support/notifications"
 
 Dir["spec/support/**/*.rb"].each { |f| require File.expand_path(f) }