diff --git a/lib/good_job.rb b/lib/good_job.rb
index c0389f7e8..1521f26bd 100644
--- a/lib/good_job.rb
+++ b/lib/good_job.rb
@@ -126,13 +126,13 @@ def self.restart(timeout: -1)
     _shutdown_all(_executables, :restart, timeout: timeout)
   end
 
-  # Sends +#shutdown+ or +#restart+ to executable objects ({GoodJob::Notifier}, {GoodJob::Poller}, {GoodJob::Scheduler})
-  # @param executables [Array<Notifier, Poller, Scheduler, MultiScheduler>] Objects to shut down.
+  # Sends +#shutdown+ or +#restart+ to executable objects ({GoodJob::Notifier}, {GoodJob::Poller}, {GoodJob::Scheduler}, {GoodJob::MultiScheduler}, {GoodJob::CronManager})
+  # @param executables [Array<Notifier, Poller, Scheduler, MultiScheduler, CronManager>] Objects to shut down.
   # @param method_name [:symbol] Method to call, e.g. +:shutdown+ or +:restart+.
   # @param timeout [nil,Numeric]
   # @return [void]
   def self._shutdown_all(executables, method_name = :shutdown, timeout: -1)
-    if timeout.positive?
+    if timeout.is_a?(Numeric) && timeout.positive?
       executables.each { |executable| executable.send(method_name, timeout: nil) }
 
       stop_at = Time.current + timeout
diff --git a/spec/lib/good_job/cron_manager_spec.rb b/spec/lib/good_job/cron_manager_spec.rb
index dc6a3e602..5abb56361 100644
--- a/spec/lib/good_job/cron_manager_spec.rb
+++ b/spec/lib/good_job/cron_manager_spec.rb
@@ -44,7 +44,7 @@
       cron_manager = described_class.new(schedules, start_on_initialize: true)
 
       wait_until(max: 5) do
-        expect(GoodJob::Job.count).to eq 3
+        expect(GoodJob::Job.count).to be > 3
       end
 
       good_job = GoodJob::Job.first