diff --git a/src/snek/system/template.py b/src/snek/system/template.py
index 7e9b316..bad98fc 100644
--- a/src/snek/system/template.py
+++ b/src/snek/system/template.py
@@ -135,7 +135,7 @@ def enrich_image_rendering(text):
             picture_template = f'''
                                 <picture>
                                     <source srcset="{element.attrs["src"]}" type="{mimetypes.guess_type(element.attrs["src"])[0]}" />
-                                    <source srcset="{element.attrs["src"]}?format=webp" type="image/webp" />
+                                    <source srcset="{element.attrs["src"]}" type="image/webp" />
                                     <img src="{element.attrs["src"]}" title="{element.attrs["src"]}" alt="{element.attrs["src"]}" />
                                 </picture>'''
             element.replace_with(BeautifulSoup(picture_template, "html.parser"))