diff --git a/components/fpspreadsheet/source/common/fpscrypto.pas b/components/fpspreadsheet/source/common/fpscrypto.pas
index c50fd8f74..cbf14bf45 100644
--- a/components/fpspreadsheet/source/common/fpscrypto.pas
+++ b/components/fpspreadsheet/source/common/fpscrypto.pas
@@ -1,5 +1,7 @@
 unit fpsCrypto;
 
+{$mode objfpc}{$H+}
+
 interface
 
 uses