diff --git a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesEvent.java b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesEvent.java
index 4ab2cc4db9..ae1da55a5d 100644
--- a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesEvent.java
+++ b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesEvent.java
@@ -60,6 +60,6 @@ public class ItemTimeSeriesEvent extends ItemEvent {
 
     @Override
     public String toString() {
-        return String.format("Item '%s' shall process timeseries %s", itemName, timeSeries.getStates().toList());
+        return String.format("Item '%s' shall process timeseries with %d values.", itemName, timeSeries.size());
     }
 }
diff --git a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesUpdatedEvent.java b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesUpdatedEvent.java
index 707762da07..dd7d14f77a 100644
--- a/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesUpdatedEvent.java
+++ b/bundles/org.openhab.core/src/main/java/org/openhab/core/items/events/ItemTimeSeriesUpdatedEvent.java
@@ -60,6 +60,6 @@ public class ItemTimeSeriesUpdatedEvent extends ItemEvent {
 
     @Override
     public String toString() {
-        return String.format("Item '%s' updated timeseries %s", itemName, timeSeries.getStates().toList());
+        return String.format("Item '%s' updated timeseries with %d values.", itemName, timeSeries.size());
     }
 }