diff --git a/py/selenium/webdriver/remote/webdriver.py b/py/selenium/webdriver/remote/webdriver.py
index 6e0113cd9e4a2..6684278a0d84a 100644
--- a/py/selenium/webdriver/remote/webdriver.py
+++ b/py/selenium/webdriver/remote/webdriver.py
@@ -920,7 +920,7 @@ def get_screenshot_as_file(self, filename) -> bool:
 
                 driver.get_screenshot_as_file('/Screenshots/foo.png')
         """
-        if not filename.lower().endswith(".png"):
+        if not str(filename).lower().endswith(".png"):
             warnings.warn(
                 "name used for saved screenshot does not match file " "type. It should end with a `.png` extension",
                 UserWarning,