diff --git a/src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java b/src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java
index 65f0ee203..c0359b01c 100644
--- a/src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java
+++ b/src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java
@@ -169,9 +169,8 @@ public class AnnouncementPeriodicTask implements PeriodicTask {
 
         List<TrackPoint> trackPoints = contentProviderUtils.getTrackPoints(track.getId());
         IntervalStatistics intervalStatistics = new IntervalStatistics();
-        intervalStatistics.build(trackPoints, (float) (PreferencesUtils.isMetricUnits(context) ? 1 * UnitConversions.KM_TO_M : 1 * UnitConversions.MI_TO_M));
-        int numIntervals = intervalStatistics.getIntervalList().size();
-        IntervalStatistics.Interval lastInterval = numIntervals > 0 ? intervalStatistics.getIntervalList().get(numIntervals - 1) : null;
+        intervalStatistics.build(trackPoints, (float) (PreferencesUtils.isMetricUnits(context) ? 1d * UnitConversions.KM_TO_M : 1d * UnitConversions.MI_TO_M));
+        IntervalStatistics.Interval lastInterval = intervalStatistics.getLastInterval();
 
         String announcement = AnnouncementUtils.getAnnouncement(context, trackStatistics, category, lastInterval);
         speakAnnouncement(announcement);
diff --git a/src/main/java/de/dennisguse/opentracks/viewmodels/IntervalStatistics.java b/src/main/java/de/dennisguse/opentracks/viewmodels/IntervalStatistics.java
index 490021e2a..cb703478f 100644
--- a/src/main/java/de/dennisguse/opentracks/viewmodels/IntervalStatistics.java
+++ b/src/main/java/de/dennisguse/opentracks/viewmodels/IntervalStatistics.java
@@ -8,7 +8,8 @@ import de.dennisguse.opentracks.util.LocationUtils;
 import de.dennisguse.opentracks.util.UnitConversions;
 
 public class IntervalStatistics {
-    List<Interval> intervalList = new ArrayList<>();
+    private List<Interval> intervalList = new ArrayList<>();
+    private float distanceInterval_m;
 
     /**
      * @param trackPointList     the list of TrackPoint.
@@ -16,6 +17,7 @@ public class IntervalStatistics {
      */
     public void build(List<TrackPoint> trackPointList, float distanceInterval_m) {
         intervalList.clear();
+        this.distanceInterval_m = distanceInterval_m;
 
         if (trackPointList == null || trackPointList.size() == 0) {
             return;
@@ -51,6 +53,30 @@ public class IntervalStatistics {
         return intervalList;
     }
 
+    /**
+     * Return the last completed interval.
+     * An interval is complete if its distance is equal to distanceInterval_m.
+     *
+     * @return the interval object or null if any interval is completed.
+     */
+    public Interval getLastInterval() {
+        if (intervalList == null) {
+            return null;
+        }
+
+        if (intervalList.size() == 1 && intervalList.get(0).getDistance_m() < distanceInterval_m) {
+            return null;
+        }
+
+        for (int i = intervalList.size() - 1; i >= 0; i--) {
+            if (intervalList.get(i).getDistance_m() >= distanceInterval_m) {
+                return this.intervalList.get(i);
+            }
+        }
+
+        return null;
+    }
+
     public static class Interval {
         private float distance_m = 0f;
         private float time_ms = 0f;