diff --git a/typo3/sysext/rte_ckeditor/ext_localconf.php b/typo3/sysext/rte_ckeditor/ext_localconf.php
index 324b8b04f724a81e33408dc6e835595fa236b272..0fde35253a1bb78b3f28ed9588493babefdfdcf0 100644
--- a/typo3/sysext/rte_ckeditor/ext_localconf.php
+++ b/typo3/sysext/rte_ckeditor/ext_localconf.php
@@ -24,6 +24,12 @@ if (TYPO3_MODE === 'BE' && !(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_CLI)) {
 }
 
 // Register the presets
-$GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['default'] = 'EXT:rte_ckeditor/Configuration/RTE/Default.yaml';
-$GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['minimal'] = 'EXT:rte_ckeditor/Configuration/RTE/Minimal.yaml';
-$GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['full'] = 'EXT:rte_ckeditor/Configuration/RTE/Full.yaml';
+if (empty($GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['default'])) {
+    $GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['default'] = 'EXT:rte_ckeditor/Configuration/RTE/Default.yaml';
+}
+if (empty($GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['minimal'])) {
+    $GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['minimal'] = 'EXT:rte_ckeditor/Configuration/RTE/Minimal.yaml';
+}
+if (empty($GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['full'])) {
+    $GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['full'] = 'EXT:rte_ckeditor/Configuration/RTE/Full.yaml';
+}