diff --git a/gui/wxpython/wxgui.py b/gui/wxpython/wxgui.py
index 05212146fd2..9b91ee031fb 100644
--- a/gui/wxpython/wxgui.py
+++ b/gui/wxpython/wxgui.py
@@ -37,6 +37,20 @@
 # during start up, remove when not needed
 import wx.adv
 
+
+# Fix GTK-CRITICAL assertion width/height >= -1
+def patch_gtk_size():
+    orig = wx.Window.DoMoveWindow
+
+    def _safe(self, x, y, w, h):
+        return orig(self, x, y, max(w, 0), max(h, 0))
+
+    wx.Window.DoMoveWindow = _safe
+
+
+patch_gtk_size()
+
+
 try:
     import wx.lib.agw.advancedsplash as SC
 except ImportError: