diff --git a/lib/gitlab/metrics/system.rb b/lib/gitlab/metrics/system.rb
index 33c0de91c11..34de40ca72f 100644
--- a/lib/gitlab/metrics/system.rb
+++ b/lib/gitlab/metrics/system.rb
@@ -57,17 +57,9 @@ module Gitlab
         end
       end
 
-      # THREAD_CPUTIME is not supported on OS X
-      if Process.const_defined?(:CLOCK_THREAD_CPUTIME_ID)
-        def self.cpu_time
-          Process
-            .clock_gettime(Process::CLOCK_THREAD_CPUTIME_ID, :float_second)
-        end
-      else
-        def self.cpu_time
-          Process
-            .clock_gettime(Process::CLOCK_PROCESS_CPUTIME_ID, :float_second)
-        end
+      def self.cpu_time
+        Process
+          .clock_gettime(Process::CLOCK_PROCESS_CPUTIME_ID, :float_second)
       end
 
       # Returns the current real time in a given precision.
diff --git a/spec/lib/gitlab/metrics/system_spec.rb b/spec/lib/gitlab/metrics/system_spec.rb
index b0603d96eb2..da87df15746 100644
--- a/spec/lib/gitlab/metrics/system_spec.rb
+++ b/spec/lib/gitlab/metrics/system_spec.rb
@@ -52,13 +52,13 @@ describe Gitlab::Metrics::System do
   end
 
   describe '.cpu_time' do
-    it 'returns a Fixnum' do
+    it 'returns a Float' do
       expect(described_class.cpu_time).to be_an(Float)
     end
   end
 
   describe '.real_time' do
-    it 'returns a Fixnum' do
+    it 'returns a Float' do
       expect(described_class.real_time).to be_an(Float)
     end
   end