diff --git a/beam-plotter.py b/beam-plotter.py
index 46f8068..dcd2162 100755
--- a/beam-plotter.py
+++ b/beam-plotter.py
@@ -210,7 +210,7 @@
         raise
 
 plt.title(title)
-fig.canvas.set_window_title(title)
+fig.canvas.manager.set_window_title(title)
 
 # Make plot area larger
 fig.tight_layout()