diff --git a/CHANGES.rst b/CHANGES.rst
index 975062d8..7eaa0973 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -25,6 +25,8 @@ Changes in this release include the following:
 * wx.Sizers can now be used as an iterator to iterate over the items within
   the sizer. (#738)
 
+* Fix Python3 division in ThumbnailCtrl. (#746)
+
 
 
 
diff --git a/wx/lib/agw/thumbnailctrl.py b/wx/lib/agw/thumbnailctrl.py
index 5e950f78..7d97cb05 100644
--- a/wx/lib/agw/thumbnailctrl.py
+++ b/wx/lib/agw/thumbnailctrl.py
@@ -1790,7 +1790,7 @@ class ScrolledThumbnail(wx.ScrolledWindow):
         :param `y`: the mouse `y` position.
         """
 
-        col = (x - self._tBorder)/(self._tWidth + self._tBorder)
+        col = (x - self._tBorder)//(self._tWidth + self._tBorder)
 
         if col >= self._cols:
             col = self._cols - 1
@@ -1942,7 +1942,7 @@ class ScrolledThumbnail(wx.ScrolledWindow):
             return
 
         # get row
-        row = self.GetSelection()/self._cols
+        row = self.GetSelection()//self._cols
         # calc position to scroll view
 
         paintRect = self.GetPaintRect()
@@ -2586,4 +2586,3 @@ class ScrolledThumbnail(wx.ScrolledWindow):
         self.Refresh()
 
 
-