diff --git a/changelogs/unreleased/osw-use-atomic-reference-instead-atomic-fixnum.yml b/changelogs/unreleased/osw-use-atomic-reference-instead-atomic-fixnum.yml
new file mode 100644
index 0000000000000000000000000000000000000000..afb2f55a9f7c971e0d7c92a6c9c70b408a4e5933
--- /dev/null
+++ b/changelogs/unreleased/osw-use-atomic-reference-instead-atomic-fixnum.yml
@@ -0,0 +1,5 @@
+---
+title: Adjust failure when starting GitLab instance on x86 systems
+merge_request:
+author: Mike Limansky
+type: fixed
diff --git a/lib/gitlab/metrics/method_call.rb b/lib/gitlab/metrics/method_call.rb
index 329b07af5db384d8a0e293b851ccdba7a3550002..c2f9db56824672a3322c8adab22edad72af30c9a 100644
--- a/lib/gitlab/metrics/method_call.rb
+++ b/lib/gitlab/metrics/method_call.rb
@@ -5,7 +5,7 @@ module Gitlab
     # Class for tracking timing information about method calls
     class MethodCall
       @@measurement_enabled_cache = Concurrent::AtomicBoolean.new(false)
-      @@measurement_enabled_cache_expires_at = Concurrent::AtomicFixnum.new(Time.now.to_i)
+      @@measurement_enabled_cache_expires_at = Concurrent::AtomicReference.new(Time.now.to_i)
       MUTEX = Mutex.new
       BASE_LABELS = { module: nil, method: nil }.freeze
       attr_reader :real_time, :cpu_time, :call_count, :labels