diff --git a/gramps/plugins/lib/libtreebase.py b/gramps/plugins/lib/libtreebase.py
index 8eaac4bd8..9d1aa8647 100644
--- a/gramps/plugins/lib/libtreebase.py
+++ b/gramps/plugins/lib/libtreebase.py
@@ -403,7 +403,7 @@ class Canvas(Page):
             
             #Calculate my (x) page
             #fix soon.  should not use .level
-            x_page = box.level[0] / colsperpage
+            x_page = box.level[0] // colsperpage
             
             self.__add_box_to_page(x_page, self.y_pages-1,
                                    x_page_offsets[x_page],