diff --git a/playwright/_impl/_element_handle.py b/playwright/_impl/_element_handle.py
index 1561e19fc..986e2b20d 100644
--- a/playwright/_impl/_element_handle.py
+++ b/playwright/_impl/_element_handle.py
@@ -457,7 +457,7 @@ def convert_select_option_values(
 
 def determine_screenshot_type(path: Union[str, Path]) -> Literal["jpeg", "png"]:
     mime_type, _ = mimetypes.guess_type(path)
-    if mime_type == "image/png":
+    if mime_type == "image/png" or mime_type is None:
         return "png"
     if mime_type == "image/jpeg":
         return "jpeg"
diff --git a/tests/async/test_screenshot.py b/tests/async/test_screenshot.py
index 36149225f..6d6710188 100644
--- a/tests/async/test_screenshot.py
+++ b/tests/async/test_screenshot.py
@@ -68,6 +68,10 @@ async def test_should_infer_screenshot_type_from_path(
     await page.screenshot(path=output_jpg_file)
     assert_image_file_format(output_jpg_file, "JPEG")
 
+    output_png_file = tmp_path / "foo"
+    await page.screenshot(path=output_png_file)
+    assert_image_file_format(output_png_file, "PNG")
+
 
 async def test_should_screenshot_with_type_argument(page: Page, tmp_path: Path) -> None:
     output_jpeg_with_png_extension = tmp_path / "foo_jpeg.png"
@@ -77,3 +81,7 @@ async def test_should_screenshot_with_type_argument(page: Page, tmp_path: Path)
     output_png_with_jpeg_extension = tmp_path / "bar_png.jpeg"
     await page.screenshot(path=output_png_with_jpeg_extension, type="png")
     assert_image_file_format(output_png_with_jpeg_extension, "PNG")
+
+    output_png_with_jpeg_extension = tmp_path / "bar_jpeg"
+    await page.screenshot(path=output_png_with_jpeg_extension, type="jpeg")
+    assert_image_file_format(output_png_with_jpeg_extension, "JPEG")