diff --git a/ui.py b/ui.py
index 5cd0bc3..4e2a224 100755
--- a/ui.py
+++ b/ui.py
@@ -102,7 +102,10 @@ class App:
         notebook.pack(expand=True, fill=BOTH)
 
     def handle_canvas_resize(self, event):
-        print(event)
+        # I don't know why the Tk system doesn't update these values.
+        self.canvas['width'] = event.width
+        self.canvas['height'] = event.height
+        # print(event)
 
     def update_star_system_tab(self, name, x, y):
         self.star_name_label['text'] = name