diff --git a/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGauge.java b/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGauge.java
index cf56a7cbe..661da88d5 100644
--- a/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGauge.java
+++ b/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGauge.java
@@ -3,7 +3,6 @@
 import hudson.model.Job;
 import hudson.model.Run;
 import io.prometheus.client.Gauge;
-import org.jenkinsci.plugins.prometheus.util.ArrayUtils;
 
 import java.time.Clock;
 
@@ -19,28 +18,21 @@ protected Gauge initCollector() {
                 .name(calculateName("running_build_duration_milliseconds"))
                 .subsystem(subsystem)
                 .namespace(namespace)
-                .labelNames(ArrayUtils.appendToArray(labelNames, "building"))
+                .labelNames(labelNames)
                 .help("Indicates the runtime of the run currently building if there is a run currently building")
                 .create();
     }
 
     @Override
     public void calculateMetric(Job jenkinsObject, String[] labelValues) {
-        boolean isBuilding = jenkinsObject.isBuilding();
 
-        String[] labels = ArrayUtils.appendToArray(labelValues, String.valueOf(isBuilding));
-        if (isBuilding) {
-            Run runningBuild = jenkinsObject.getLastBuild();
-            if (runningBuild != null) {
-                long start = runningBuild.getStartTimeInMillis();
-                // Using Clock to be able to mock in test
-                long end = Clock.systemUTC().millis();
-                long duration = Math.max(end - start, 0);
-                this.collector.labels(labels).set(duration);
-                return;
-            }
+        Run runningBuild = jenkinsObject.getLastBuild();
+        if (runningBuild != null && runningBuild.isBuilding()) {
+            long start = runningBuild.getStartTimeInMillis();
+            // Using Clock to be able to mock in test
+            long end = Clock.systemUTC().millis();
+            long duration = Math.max(end - start, 0);
+            this.collector.labels(labelValues).set(duration);
         }
-
-        this.collector.labels(labels).set(0.0);
     }
 }
diff --git a/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/NbBuildsGauge.java b/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/NbBuildsGauge.java
index 002e93e83..b40556d42 100644
--- a/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/NbBuildsGauge.java
+++ b/src/main/java/org/jenkinsci/plugins/prometheus/metrics/jobs/NbBuildsGauge.java
@@ -3,6 +3,7 @@
 import hudson.model.Job;
 import io.prometheus.client.Gauge;
 
+
 public class NbBuildsGauge extends BaseJobMetricCollector<Job, Gauge> {
 
     public NbBuildsGauge(String[] labelNames, String namespace, String subsystem) {
diff --git a/src/test/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGaugeTest.java b/src/test/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGaugeTest.java
index 84540ab34..44b3e4640 100644
--- a/src/test/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGaugeTest.java
+++ b/src/test/java/org/jenkinsci/plugins/prometheus/metrics/jobs/CurrentRunDurationGaugeTest.java
@@ -22,7 +22,7 @@ public class CurrentRunDurationGaugeTest extends JobCollectorTest {
     @Override
     @Test
     public void testCollectResult() {
-        when(job.isBuilding()).thenReturn(true);
+        when(currentRun.isBuilding()).thenReturn(true);
         when(currentRun.getStartTimeInMillis()).thenReturn(1000L);
         when(job.getLastBuild()).thenReturn(currentRun);
 
@@ -48,7 +48,7 @@ public void testCollectResult() {
 
     @Test
     public void testCurrentlyRunningLabelValue() {
-        when(job.isBuilding()).thenReturn(true);
+        when(currentRun.isBuilding()).thenReturn(true);
         when(currentRun.getStartTimeInMillis()).thenReturn(1000L);
         when(job.getLastBuild()).thenReturn(currentRun);
 
@@ -59,11 +59,8 @@ public void testCurrentlyRunningLabelValue() {
         List<String> labelNames = sut.collect().get(0).samples.get(0).labelNames;
         List<String> labelValues = sut.collect().get(0).samples.get(0).labelValues;
 
-        Assertions.assertEquals(3, labelNames.size());
-        Assertions.assertEquals(3, labelValues.size());
-
-        Assertions.assertEquals("building", labelNames.get(2));
-        Assertions.assertEquals("true", labelValues.get(2));
+        Assertions.assertEquals(2, labelNames.size());
+        Assertions.assertEquals(2, labelValues.size());
 
         double value = sut.collect().get(0).samples.get(0).value;
 
@@ -71,25 +68,15 @@ public void testCurrentlyRunningLabelValue() {
     }
 
     @Test
-    public void testCurrentlyNotRunningLabelValue() {
-        when(job.isBuilding()).thenReturn(false);
+    public void testCurrentlyNotRunning() {
+        when(currentRun.isBuilding()).thenReturn(false);
+        when(job.getLastBuild()).thenReturn(currentRun);
 
         CurrentRunDurationGauge sut = new CurrentRunDurationGauge(new String[]{"jenkins_job", "repo"}, "default", "jenkins");
 
         sut.calculateMetric(job, new String[]{"job1", "NA"});
 
-        List<String> labelNames = sut.collect().get(0).samples.get(0).labelNames;
-        List<String> labelValues = sut.collect().get(0).samples.get(0).labelValues;
-
-        Assertions.assertEquals(3, labelNames.size());
-        Assertions.assertEquals(3, labelValues.size());
-
-        Assertions.assertEquals("building", labelNames.get(2));
-        Assertions.assertEquals("false", labelValues.get(2));
-
-        double value = sut.collect().get(0).samples.get(0).value;
-
-        Assertions.assertEquals(0.0, value);
+        Assertions.assertEquals(1, sut.collect().size(), "Expected not to be calculated");
     }