diff --git a/src/PIL/WebPImagePlugin.py b/src/PIL/WebPImagePlugin.py
index 011e10716..77a02e4b9 100644
--- a/src/PIL/WebPImagePlugin.py
+++ b/src/PIL/WebPImagePlugin.py
@@ -38,9 +38,8 @@ class WebPImageFile(ImageFile.ImageFile):
 
     format = "WEBP"
     format_description = "WebP image"
-    __loaded = -1
+    __loaded = 0
     __logical_frame = 0
-    __physical_frame = 0
 
     def _open(self):
         if not _webp.HAVE_WEBPANIM: