diff --git a/src/lib/Persistence/Cache/ContentHandler.php b/src/lib/Persistence/Cache/ContentHandler.php
index 5e9b28eebb..5938eef614 100644
--- a/src/lib/Persistence/Cache/ContentHandler.php
+++ b/src/lib/Persistence/Cache/ContentHandler.php
@@ -131,7 +131,7 @@ public function copy($contentId, $versionNo = null, $newOwnerId = null)
      */
     public function load($contentId, $versionNo = null, array $translations = null)
     {
-        $keySuffix = $versionNo ? "-${versionNo}-" : '-';
+        $keySuffix = $versionNo ? "-{$versionNo}-" : '-';
         $keySuffix .= empty($translations) ? self::ALL_TRANSLATIONS_KEY : implode('|', $translations);
 
         return $this->getCacheValue(
@@ -238,7 +238,7 @@ function () use ($remoteId) {
      */
     public function loadVersionInfo($contentId, $versionNo = null)
     {
-        $keySuffix = $versionNo ? "-${versionNo}" : '';
+        $keySuffix = $versionNo ? "-{$versionNo}" : '';
         $cacheItem = $this->cache->getItem(
             $this->cacheIdentifierGenerator->generateKey(
                 self::CONTENT_VERSION_INFO_IDENTIFIER,