diff --git a/invesalius/gui/frame.py b/invesalius/gui/frame.py
index d8bf777..ea1a76b 100755
--- a/invesalius/gui/frame.py
+++ b/invesalius/gui/frame.py
@@ -314,6 +314,8 @@ class LayoutToolBar(wx.ToolBar):
         wx.ToolBar.__init__(self, parent, -1, wx.DefaultPosition, wx.DefaultSize, wx.TB_FLAT|wx.TB_NODIVIDER)
         if sys.platform == 'darwin':
             self.SetToolBitmapSize(wx.Size(25,25))
+        else:
+            self.SetToolBitmapSize(wx.Size(16,16))
         self.parent = parent
         self.__init_items()
         self.__bind_events()
--
libgit2 0.21.2