diff --git a/include/fpdi/fpdi_bridge.php b/include/fpdi/fpdi_bridge.php
index 5ec4d677..3f37762b 100644
--- a/include/fpdi/fpdi_bridge.php
+++ b/include/fpdi/fpdi_bridge.php
@@ -29,7 +29,7 @@ if (!class_exists('TCPDF', false)) {
     /**
      * Class fpdi_bridge
      */
-    class fpdi_bridge extends FPDF
+    class fpdi_bridge extends PDF_Unicode
     {
         // empty body
     }