diff --git a/lib/api/api_util.dart b/lib/api/api_util.dart
index 5ca6d01b..00e95221 100644
--- a/lib/api/api_util.dart
+++ b/lib/api/api_util.dart
@@ -31,7 +31,7 @@ String getFilePreviewUrlRelative(
   bool a,
 }) {
   final filePath = Uri.encodeQueryComponent(file.strippedPath);
-  var url = "core/preview.png?file=$filePath&x=$width&y=$height";
+  var url = "index.php/core/preview.png?file=$filePath&x=$width&y=$height";
   if (mode != null) {
     url = "$url&mode=$mode";
   }