diff --git a/sc/source/ui/inc/undoblk.hxx b/sc/source/ui/inc/undoblk.hxx
index 378a42b9479d..fa1c703b107b 100644
--- a/sc/source/ui/inc/undoblk.hxx
+++ b/sc/source/ui/inc/undoblk.hxx
@@ -23,6 +23,7 @@
 #include "spellparam.hxx"
 #include "cellmergeoption.hxx"
 #include <paramisc.hxx>
+#include <tokenarray.hxx>
 #include <editeng/boxitem.hxx>
 
 #include <memory>
@@ -728,8 +729,6 @@ private:
     ScDocumentUniquePtr xRedoDoc;
 };
 
-class ScTokenArray;
-
 class ScUndoEnterMatrix: public ScBlockUndo
 {
 public: