diff --git a/typo3/sysext/rtehtmlarea/Classes/RteHtmlAreaApi.php b/typo3/sysext/rtehtmlarea/Classes/RteHtmlAreaApi.php
index 76baf3ba9f438f9dd05f5bf756d5c35a546d0807..0676d3d52d9f1f856e0a65be9751fc1c95eb39d5 100644
--- a/typo3/sysext/rtehtmlarea/Classes/RteHtmlAreaApi.php
+++ b/typo3/sysext/rtehtmlarea/Classes/RteHtmlAreaApi.php
@@ -320,7 +320,7 @@ abstract class RteHtmlAreaApi
                 throw new \RuntimeException($failure, 1294585668);
             }
         }
-        if (isset($GLOBALS['TSFE'])) {
+        if ($this->isFrontend() || $this->isFrontendEditActive()) {
             $fileName = $relativeFilename;
         } else {
             $fileName = '../' . $relativeFilename;