diff --git a/java/com/google/gerrit/metrics/proc/OperatingSystemMXBeanFactory.java b/java/com/google/gerrit/metrics/proc/OperatingSystemMXBeanFactory.java
index 041f86cf29..ef0ced61c6 100644
--- a/java/com/google/gerrit/metrics/proc/OperatingSystemMXBeanFactory.java
+++ b/java/com/google/gerrit/metrics/proc/OperatingSystemMXBeanFactory.java
@@ -23,6 +23,8 @@ import java.util.Arrays;
 class OperatingSystemMXBeanFactory {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
+  private OperatingSystemMXBeanFactory() {}
+
   static OperatingSystemMXBeanInterface create() {
     OperatingSystemMXBean sys = ManagementFactory.getOperatingSystemMXBean();
     if (sys instanceof UnixOperatingSystemMXBean) {