diff --git a/core/Settings/SettingManager.php b/core/Settings/SettingManager.php
index c4a1fe0a..cc1aee16 100644
--- a/core/Settings/SettingManager.php
+++ b/core/Settings/SettingManager.php
@@ -130,7 +130,7 @@ class SettingManager implements CallbackListener, UsageInformationAble {
 	 * @return bool
 	 */
 	private function deleteUnusedSettings() {
-		if ($this->getSettingValue($this, self::SETTING_DELETE_UNUSED_SETTING_AT_START)) {
+		if (!$this->getSettingValue($this, self::SETTING_DELETE_UNUSED_SETTING_AT_START)) {
 			return;
 		}