diff --git a/lib/concurrent/configuration.rb b/lib/concurrent/configuration.rb
index bac434200..174823177 100644
--- a/lib/concurrent/configuration.rb
+++ b/lib/concurrent/configuration.rb
@@ -131,8 +131,6 @@ def self.global_immediate_executor
   # Global thread pool user for global *timers*.
   #
   # @return [Concurrent::TimerSet] the thread pool
-  #
-  # @see Concurrent::timer
   def self.global_timer_set
     GLOBAL_TIMER_SET.value
   end
diff --git a/lib/concurrent/timer_task.rb b/lib/concurrent/timer_task.rb
index 042be35e6..85f2d0f94 100644
--- a/lib/concurrent/timer_task.rb
+++ b/lib/concurrent/timer_task.rb
@@ -297,13 +297,14 @@ def kill_execution
 
     # @!visibility private
     def schedule_next_task(interval = execution_interval)
-      Concurrent::timer(interval, Concurrent::Event.new, &method(:execute_task))
+      ScheduledTask.execute(interval, args: [Concurrent::Event.new], &method(:execute_task))
+      nil
     end
 
     # @!visibility private
     def execute_task(completion)
-      return unless @running.true?
-      Concurrent::timer(execution_interval, completion, &method(:timeout_task))
+      return nil unless @running.true?
+      ScheduledTask.execute(execution_interval, args: [completion], &method(:timeout_task))
       _success, value, reason = @executor.execute(self)
       if completion.try?
         self.value = value
@@ -313,6 +314,7 @@ def execute_task(completion)
           [time, self.value, reason]
         end
       end
+      nil
     end
 
     # @!visibility private