diff --git a/mujoco_viewer/mujoco_viewer.py b/mujoco_viewer/mujoco_viewer.py
index 75c7355..c227448 100644
--- a/mujoco_viewer/mujoco_viewer.py
+++ b/mujoco_viewer/mujoco_viewer.py
@@ -308,6 +308,7 @@ def read_pixels(self, camid=None, depth=False):
 
 
     def render(self):
+        glfw.make_context_current(self.window)
         if self.render_mode == 'offscreen':
             raise NotImplementedError(
                 "Use 'read_pixels()' for 'offscreen' mode.")