diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index d438ae6..ebaa210 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -61,6 +61,7 @@ class ContourMIPConfig(wx.Panel):
     def __init__(self, prnt, orientation):
         wx.Panel.__init__(self, prnt)
         self.mip_size_spin = wx.SpinCtrl(self, -1, min=1, max=240,
+                                         value=str(const.PROJECTION_MIP_SIZE),
                                          initial=const.PROJECTION_MIP_SIZE)
         self.mip_size_spin.SetToolTip(wx.ToolTip(_("Number of slices used to compound the visualization.")))
         w, h = self.mip_size_spin.GetTextExtent('M')
--
libgit2 0.21.2