diff --git a/starmath/inc/ElementsDockingWindow.hxx b/starmath/inc/ElementsDockingWindow.hxx
index 2e48afd10fdf..e7d49ca14969 100644
--- a/starmath/inc/ElementsDockingWindow.hxx
+++ b/starmath/inc/ElementsDockingWindow.hxx
@@ -31,7 +31,6 @@
 #include <vector>
 
 class SmDocShell;
-class SvTreeListBox;
 struct ElementData;
 
 class SmElementsControl