diff --git a/infra/prism-api/src/main/java/com/evolveum/midpoint/prism/util/CloneUtil.java b/infra/prism-api/src/main/java/com/evolveum/midpoint/prism/util/CloneUtil.java
index fe9dcd91b30..7ad487d37bf 100644
--- a/infra/prism-api/src/main/java/com/evolveum/midpoint/prism/util/CloneUtil.java
+++ b/infra/prism-api/src/main/java/com/evolveum/midpoint/prism/util/CloneUtil.java
@@ -116,7 +116,7 @@ public static <T> T clone(T orig) {
 		 */
 		if (orig instanceof Duration) {
 			//noinspection unchecked
-			return (T) XmlTypeConverter.createDuration((Duration) orig);
+			return (T) XmlTypeConverter.createDuration(((Duration) orig).toString()); //without toString(), value has wrong format for example from P3M is P0Y3M0DT0H0M0S
 		}
 		if (orig instanceof Cloneable) {
 			T clone = javaLangClone(orig);