diff --git a/codesystems/CodeSystem-UKCore-DateTimeType.xml b/codesystems/CodeSystem-UKCore-DateTimeType.xml
index e345f444..e00bb79d 100644
--- a/codesystems/CodeSystem-UKCore-DateTimeType.xml
+++ b/codesystems/CodeSystem-UKCore-DateTimeType.xml
@@ -86,8 +86,8 @@
 		<definition value="The date/time that the first response arrived at the incident location that counts as the arrival time based on the National Ambulance Quality Indicator definitions"/>
 	</concept>
 	<concept>
-		<code value="last-changed-date"/>
-		<display value="Last Changed Date"/>
+		<code value="last-change-date"/>
+		<display value="Last Change Date"/>
 		<definition value="The date/time that the data was last changed"/>
 	</concept>
 </CodeSystem>