diff --git a/src/main/java/org/olat/core/configuration/PersistedProperties.java b/src/main/java/org/olat/core/configuration/PersistedProperties.java
index 56f976905051f40f5afcab6f7776683aa70bc1c7..baf51868fd6a95980c0cdb289ad4769fe3547ed9 100644
--- a/src/main/java/org/olat/core/configuration/PersistedProperties.java
+++ b/src/main/java/org/olat/core/configuration/PersistedProperties.java
@@ -443,7 +443,8 @@ public class PersistedProperties extends LogDelegator implements Initializable,
 	
 	public void removeProperty(String propertyName, boolean saveConfiguration) {
 		synchronized (configuredProperties) { // make read/write save in VM
-			configuredProperties.remove(propertyName);
+			Object removedProperty = configuredProperties.remove(propertyName);
+			propertiesDirty |= removedProperty != null;
 			if (saveConfiguration) {
 				savePropertiesAndFireChangedEvent();
 			}