diff --git a/Gemfile b/Gemfile
index c5337ce..611a2d8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,6 @@ source 'https://rubygems.org'
 
 group :development do
   gem 'rake'
-  gem 'rake-compiler'
   gem 'sinatra', require: false
   gem 'slim', require: false
 end
diff --git a/Rakefile b/Rakefile
index 9ad444d..9af881f 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,8 +1,5 @@
 require 'bundler/gem_tasks'
 require 'rake/testtask'
-require 'rake/extensiontask'
-
-Rake::ExtensionTask.new('sidetiq_ext')
 
 Rake::TestTask.new do |t|
   t.pattern = 'test/**/test_*.rb'
diff --git a/ext/sidetiq_ext/extconf.rb b/ext/sidetiq_ext/extconf.rb
deleted file mode 100644
index ff68125..0000000
--- a/ext/sidetiq_ext/extconf.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-require 'rbconfig'
-require 'mkmf'
-create_makefile('sidetiq_ext')
-
diff --git a/ext/sidetiq_ext/sidetiq_ext.c b/ext/sidetiq_ext/sidetiq_ext.c
deleted file mode 100644
index 4723f25..0000000
--- a/ext/sidetiq_ext/sidetiq_ext.c
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <ruby.h>
-#include <assert.h>
-#include "sidetiq_ext.h"
-
-#ifdef __APPLE__
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <mach/mach.h>
-#include <mach/clock.h>
-#include <mach/mach_time.h>
-#include <errno.h>
-#include <unistd.h>
-#include <sched.h>
-#else
-#include <time.h>
-#endif
-
-VALUE msidetiq;
-VALUE esidetiq_error;
-VALUE csidetiq_clock;
-
-#ifdef __APPLE__
-static mach_timebase_info_data_t clock_gettime_inf;
-
-typedef enum {
-        CLOCK_REALTIME,
-        CLOCK_MONOTONIC,
-        CLOCK_PROCESS_CPUTIME_ID,
-        CLOCK_THREAD_CPUTIME_ID
-} clockid_t;
-
-int clock_gettime(clockid_t clk_id, struct timespec *tp)
-{
-        kern_return_t ret;
-        clock_serv_t clk;
-        clock_id_t clk_serv_id;
-        mach_timespec_t tm;
-        uint64_t start, end, delta, nano;
-        int retval = -1;
-
-        switch (clk_id) {
-                case CLOCK_REALTIME:
-                case CLOCK_MONOTONIC:
-                        clk_serv_id = clk_id == CLOCK_REALTIME ? CALENDAR_CLOCK : SYSTEM_CLOCK;
-                        if (KERN_SUCCESS == (ret = host_get_clock_service(mach_host_self(), clk_serv_id, &clk))) {
-                                if (KERN_SUCCESS == (ret = clock_get_time(clk, &tm))) {
-                                        tp->tv_sec  = tm.tv_sec;
-                                        tp->tv_nsec = tm.tv_nsec;
-                                        retval = 0;
-                                }
-                        }
-                        if (KERN_SUCCESS != ret) {
-                                errno = EINVAL;
-                                retval = -1;
-                        }
-                break;
-                case CLOCK_PROCESS_CPUTIME_ID:
-                case CLOCK_THREAD_CPUTIME_ID:
-                        start = mach_absolute_time();
-                        if (clk_id == CLOCK_PROCESS_CPUTIME_ID) {
-                                getpid();
-                        } else {
-                                sched_yield();
-                        }
-                        end = mach_absolute_time();
-                        delta = end - start;
-                        if (0 == clock_gettime_inf.denom) {
-                                mach_timebase_info(&clock_gettime_inf);
-                        }
-                        nano = delta * clock_gettime_inf.numer / clock_gettime_inf.denom;
-                        tp->tv_sec = nano * 1e-9;
-                        tp->tv_nsec = nano - (tp->tv_sec * 1e9);
-                        retval = 0;
-                break;
-                default:
-                        errno = EINVAL;
-                        retval = -1;
-        }
-        return retval;
-}
-#endif
-
-static VALUE sidetiq_gettime(VALUE self)
-{
-        struct timespec time;
-        assert(clock_gettime(CLOCK_REALTIME, &time) == 0);
-        return rb_time_nano_new(time.tv_sec, time.tv_nsec);
-}
-
-void Init_sidetiq_ext()
-{
-        msidetiq = rb_define_module("Sidetiq");
-        esidetiq_error = rb_define_class_under(msidetiq, "Error", rb_eStandardError);
-        csidetiq_clock = rb_define_class_under(msidetiq, "Clock", rb_cObject);
-        rb_define_private_method(csidetiq_clock, "clock_gettime", sidetiq_gettime, 0);
-}
-
diff --git a/ext/sidetiq_ext/sidetiq_ext.h b/ext/sidetiq_ext/sidetiq_ext.h
deleted file mode 100644
index 6793fe6..0000000
--- a/ext/sidetiq_ext/sidetiq_ext.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef __SIDETIQ_EXT_H__
-#define __SIDETIQ_EXT_H__
-#include <ruby.h>
-
-void Init_sidetiq_ext();
-static VALUE sidetiq_gettime(VALUE self);
-
-/* module Sidetiq */
-extern VALUE msidetiq;
-
-/* class Sidetiq::Error < StandardError */
-extern VALUE esidetiq_error;
-
-/* class Sidetiq::Clock */
-extern VALUE csidetiq_clock;
-
-#endif
diff --git a/lib/sidetiq.rb b/lib/sidetiq.rb
index 5d745cc..a4960e4 100644
--- a/lib/sidetiq.rb
+++ b/lib/sidetiq.rb
@@ -7,9 +7,6 @@ require 'singleton'
 require 'ice_cube'
 require 'sidekiq'
 
-# c extensions
-require 'sidetiq_ext'
-
 # internal
 require 'sidetiq/config'
 require 'sidetiq/clock'
diff --git a/lib/sidetiq/clock.rb b/lib/sidetiq/clock.rb
index 561de18..75f4d4c 100644
--- a/lib/sidetiq/clock.rb
+++ b/lib/sidetiq/clock.rb
@@ -67,9 +67,6 @@ module Sidetiq
 
     # Public: Returns the current time used by the clock.
     #
-    # Sidetiq::Clock uses `clock_gettime()` on UNIX systems and
-    # `mach_absolute_time()` on Mac OS X.
-    #
     # Examples
     #
     #   gettime
@@ -77,7 +74,7 @@ module Sidetiq
     #
     # Returns a Time instance.
     def gettime
-      Sidetiq.config.utc ? clock_gettime.utc : clock_gettime
+      Sidetiq.config.utc ? Time.now.utc : Time.now
     end
 
     # Public: Starts the clock unless it is already running.
diff --git a/test/test_errors.rb b/test/test_errors.rb
deleted file mode 100644
index a8c919b..0000000
--- a/test/test_errors.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-require_relative 'helper'
-
-class TestErrors < Sidetiq::TestCase
-  def test_error_superclass
-    assert_equal StandardError, Sidetiq::Error.superclass
-  end
-end