diff --git a/Workbench/midpoint_server/container_files/mp-home/post-initial-objects/resources/100-source-sis-persons.xml b/Workbench/midpoint_server/container_files/mp-home/post-initial-objects/resources/100-source-sis-persons.xml
index 0ca8cb0..9652c35 100644
--- a/Workbench/midpoint_server/container_files/mp-home/post-initial-objects/resources/100-source-sis-persons.xml
+++ b/Workbench/midpoint_server/container_files/mp-home/post-initial-objects/resources/100-source-sis-persons.xml
@@ -79,6 +79,26 @@
 				<ref>ri:uid</ref>
 				<displayName>UID</displayName>
                 <inbound>
+                   <expression>
+                        <script xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:c="http://midpoint.evolveum.com/xml/ns/public/common/common-3" xsi:type="c:ScriptExpressionEvaluatorType">
+                            <code>
+                            import com.evolveum.midpoint.xml.ns._public.common.common_3.*
+				import com.evolveum.prism.xml.ns._public.types_3.*
+				import static com.evolveum.midpoint.schema.constants.SchemaConstants.*
+				import com.evolveum.midpoint.schema.util.*
+				import com.evolveum.midpoint.prism.path.*
+                		import com.evolveum.midpoint.schema.constants.*
+                		import com.evolveum.midpoint.prism.delta.*
+                		TRIGGER_FIRE_AFTER = 180000
+                		TRIGGER_SAFETY_MARGIN = 4000
+                		added = midpoint
+                            			.getOptimizingTriggerCreator(TRIGGER_FIRE_AFTER, TRIGGER_SAFETY_MARGIN)
+                            			.createForNamedUser(input)
+                    			log.info('Recompute trigger for {}: {}', input, added ? 'added' : 'not added (already present or user not found)')
+                    			return input
+                         </code>
+                        </script>
+                    </expression>
                     <target>
                         <path>name</path>
                     </target>