diff --git a/src/main/java/de/jottyfan/timetrack/spring/done/SummaryBean.java b/src/main/java/de/jottyfan/timetrack/spring/done/SummaryBean.java
index 240c73a..052429e 100644
--- a/src/main/java/de/jottyfan/timetrack/spring/done/SummaryBean.java
+++ b/src/main/java/de/jottyfan/timetrack/spring/done/SummaryBean.java
@@ -132,6 +132,8 @@ public class SummaryBean implements Serializable {
 	 */
 	public String getOverdue() {
 		Duration overdue = getTotalTime().minus(maxDayWorktime);
-		return String.format("%02d:%02d", overdue.toHours(), overdue.toMinutesPart());
+		int minutes = overdue.toMinutesPart();
+		minutes = minutes < 0 ? (-1 * minutes) : minutes;
+		return String.format("%02d:%02d", overdue.toHours(), minutes);
 	}
 }