diff --git a/src/main/java/org/jenkinsci/plugins/prometheus/DiskUsageCollector.java b/src/main/java/org/jenkinsci/plugins/prometheus/DiskUsageCollector.java
index d5ce11669..2060d8c92 100644
--- a/src/main/java/org/jenkinsci/plugins/prometheus/DiskUsageCollector.java
+++ b/src/main/java/org/jenkinsci/plugins/prometheus/DiskUsageCollector.java
@@ -1,7 +1,8 @@
 package org.jenkinsci.plugins.prometheus;
 
 import com.cloudbees.simplediskusage.DiskItem;
-import com.cloudbees.simplediskusage.JobDiskItem;
+import com.cloudbees.simplediskusage.JobDiskItem;
+import edu.umd.cs.findbugs.annotations.NonNull;
 import io.prometheus.client.Collector;
 import jenkins.model.Jenkins;
 import org.jenkinsci.plugins.prometheus.collectors.CollectorFactory;
@@ -11,21 +12,20 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.annotation.Nonnull;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.FileStore;
 import java.nio.file.Files;
 import java.util.*;
 import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
+import java.util.stream.Stream;
+
 public class DiskUsageCollector extends Collector {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(DiskUsageCollector.class);
 
     @Override
-    @Nonnull
+    @NonNull
     public List<MetricFamilySamples> collect() {
 
         if (!PrometheusConfiguration.get().getCollectDiskUsage()) {
@@ -44,7 +44,7 @@ public List<MetricFamilySamples> collect() {
         }
     }
 
-    @Nonnull
+    @NonNull
     private static List<MetricFamilySamples> collectDiskUsage() throws IOException {
         final com.cloudbees.simplediskusage.QuickDiskUsagePlugin diskUsagePlugin = Jenkins.get()
                 .getPlugin(com.cloudbees.simplediskusage.QuickDiskUsagePlugin.class);
diff --git a/src/main/java/org/jenkinsci/plugins/prometheus/config/PrometheusConfiguration.java b/src/main/java/org/jenkinsci/plugins/prometheus/config/PrometheusConfiguration.java
index 2723b55fa..f00f46131 100644
--- a/src/main/java/org/jenkinsci/plugins/prometheus/config/PrometheusConfiguration.java
+++ b/src/main/java/org/jenkinsci/plugins/prometheus/config/PrometheusConfiguration.java
@@ -14,7 +14,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.annotation.CheckForNull;
+import edu.umd.cs.findbugs.annotations.CheckForNull;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;