diff --git a/changelogs/unreleased/pawel-disable_prometheus_metrics.yml b/changelogs/unreleased/pawel-disable_prometheus_metrics.yml
new file mode 100644
index 00000000000..74d83256603
--- /dev/null
+++ b/changelogs/unreleased/pawel-disable_prometheus_metrics.yml
@@ -0,0 +1,5 @@
+---
+title: Force disable Prometheus metrics
+merge_request:
+author:
+type: fixed
diff --git a/lib/gitlab/metrics/prometheus.rb b/lib/gitlab/metrics/prometheus.rb
index 09103b4ca2d..4f165d12a94 100644
--- a/lib/gitlab/metrics/prometheus.rb
+++ b/lib/gitlab/metrics/prometheus.rb
@@ -17,9 +17,9 @@ module Gitlab
       end
 
       def prometheus_metrics_enabled?
-        return @prometheus_metrics_enabled if defined?(@prometheus_metrics_enabled)
-
-        @prometheus_metrics_enabled = prometheus_metrics_enabled_unmemoized
+        # force disable prometheus_metrics until
+        # https://gitlab.com/gitlab-org/prometheus-client-mmap/merge_requests/11 is ready
+        false
       end
 
       def registry