diff --git a/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/util/SystemResourcesCounter.java b/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/util/SystemResourcesCounter.java
index a59d129fb5a1c..20b89227c43eb 100644
--- a/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/util/SystemResourcesCounter.java
+++ b/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/util/SystemResourcesCounter.java
@@ -53,8 +53,8 @@ public class SystemResourcesCounter extends Thread {
 
     private volatile boolean running = true;
 
-    private long[] previousCpuTicks;
-    private long[][] previousProcCpuTicks;
+    private volatile long[] previousCpuTicks;
+    private volatile long[][] previousProcCpuTicks;
     private long[] bytesReceivedPerInterface;
     private long[] bytesSentPerInterface;