diff --git a/code/extensions/BlogMemberExtension.php b/code/extensions/BlogMemberExtension.php
index 4e82ba2..4812f66 100644
--- a/code/extensions/BlogMemberExtension.php
+++ b/code/extensions/BlogMemberExtension.php
@@ -35,6 +35,10 @@ class BlogMemberExtension extends DataExtension {
 	public function onBeforeWrite() {
 		$count = 1;
 
+		if ($this->owner->URLSegment && !$this->owner->isChanged('FirstName') && !$this->owner->isChanged('Surname')) {
+			return;
+		}
+
 		$this->owner->URLSegment = $this->generateURLSegment();
 
 		while(!$this->validURLSegment()) {