diff --git a/src/PIL/WebPImagePlugin.py b/src/PIL/WebPImagePlugin.py
index c7f855527f0..686fccbf59c 100644
--- a/src/PIL/WebPImagePlugin.py
+++ b/src/PIL/WebPImagePlugin.py
@@ -318,5 +318,5 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
 if SUPPORTED:
     Image.register_save(WebPImageFile.format, _save)
     Image.register_save_all(WebPImageFile.format, _save_all)
-    Image.register_extension(WebPImageFile.format, ".webp")
+    Image.register_extensions(WebPImageFile.format, [".webp", ".wbp"])
     Image.register_mime(WebPImageFile.format, "image/webp")