diff --git a/Classes/Utilities/IconRegistrationUtility.php b/Classes/Utilities/IconRegistrationUtility.php
index 946506c..51a4fbb 100644
--- a/Classes/Utilities/IconRegistrationUtility.php
+++ b/Classes/Utilities/IconRegistrationUtility.php
@@ -70,7 +70,7 @@ public static function convertFilenameToIdentifier($filenameOrPath)
     {
         $ext = pathinfo($filenameOrPath, PATHINFO_EXTENSION);
 
-        return str_replace(
+        return 'tx-flexiblepages-' . str_replace(
             '_',
             '-',
             GeneralUtility::camelCaseToLowerCaseUnderscored(basename($filenameOrPath, '.' . $ext))