diff --git a/src/shared/Version.php b/src/shared/Version.php
index a5f0619f..ca4deb17 100644
--- a/src/shared/Version.php
+++ b/src/shared/Version.php
@@ -29,7 +29,7 @@ public function getVersion(): string {
     }
 
     public function getInfoString() {
-        return 'phpDox ' . $this->getVersion() . ' - Copyright (C) 2010 - ' . \date('Y', \getenv('SOURCE_DATE_EPOCH') ?: \time()) . ' by Arne Blankerts and Contributors';
+        return 'phpDox ' . $this->getVersion() . ' - Copyright (C) 2010 - ' . \date('Y', (int)\getenv('SOURCE_DATE_EPOCH') ?: \time()) . ' by Arne Blankerts and Contributors';
     }
 
     public function getGeneratedByString() {