diff --git a/apps/user_ldap/lib/Configuration.php b/apps/user_ldap/lib/Configuration.php
index ab5aa23f98d..63390a60fd4 100644
--- a/apps/user_ldap/lib/Configuration.php
+++ b/apps/user_ldap/lib/Configuration.php
@@ -262,6 +262,7 @@ class Configuration {
 	 */
 	public function saveConfiguration() {
 		$cta = array_flip($this->getConfigTranslationArray());
+		$changed = false;
 		foreach ($this->unsavedChanges as $key) {
 			$value = $this->config[$key];
 			switch ($key) {
@@ -291,9 +292,12 @@ class Configuration {
 			if (is_null($value)) {
 				$value = '';
 			}
+			$changed = true;
 			$this->saveValue($cta[$key], $value);
 		}
-		$this->saveValue('_lastChange', time());
+		if ($changed) {
+			$this->saveValue('_lastChange', (string)time());
+		}
 		$this->unsavedChanges = [];
 	}