diff --git a/mainwin.py b/mainwin.py
index 419acfb..70a3b43 100644
--- a/mainwin.py
+++ b/mainwin.py
@@ -7,7 +7,6 @@ class MainWin(wx.Frame):
 		self.main_sizer = wx.BoxSizer(wx.VERTICAL)
 
 		# Top buttons
-
 		self.top_sizer = wx.BoxSizer(wx.HORIZONTAL)
 		self.plan_btn = wx.Button(self, label="Plan",
 			style=wx.BU_EXACTFIT)
@@ -15,10 +14,11 @@ class MainWin(wx.Frame):
 			style=wx.BU_EXACTFIT)
 		self.ser_sel = wx.Choice(self, choices=["(none)"])
 
-		for i in (self.plan_btn, self.conn_btn, self.ser_sel):
-			self.top_sizer.Add(i, 1, wx.EXPAND)
+		for i in (self.plan_btn, self.conn_btn):
+			self.top_sizer.Add(i, 0, wx.EXPAND)
+		self.top_sizer.Add(self.ser_sel, 1, wx.EXPAND)
 
-		self.main_sizer.Add(self.top_sizer, 1, wx.EXPAND)
+		self.main_sizer.Add(self.top_sizer, 0, wx.EXPAND)
 
 		self.commbox = wx.TextCtrl(self, style=
 			wx.TE_MULTILINE | wx.TE_READONLY | wx.TE_RICH2)