diff --git a/doc/source/conf.py b/doc/source/conf.py
index 6059b1e9..f31a3515 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -20,7 +20,7 @@
 pyvista.OFF_SCREEN = True
 
 # must be less than or equal to the XVFB window size
-pyvista.rcParams["window_size"] = np.array([1024, 768])
+pyvista.global_theme.window_size = np.array([1024, 768])
 
 # Save figures in specified directory
 pyvista.FIGURE_PATH = os.path.join(os.path.abspath("./images/"), "auto-generated/")