diff -rupN python-imaging-Pillow-75af7e0/_webp.c python-imaging-Pillow-75af7e0-new/_webp.c
--- python-imaging-Pillow-75af7e0/_webp.c	2013-07-02 14:52:49.000000000 +0200
+++ python-imaging-Pillow-75af7e0-new/_webp.c	2013-08-29 13:03:34.558822782 +0200
@@ -17,7 +17,7 @@ PyObject* WebPEncode_wrapper(PyObject* s
     Py_ssize_t size;
     size_t ret_size;
 
-    if (!PyArg_ParseTuple(args, "s#nifs",(char**)&rgb, &size, &width, &height, &quality_factor, &mode)) {
+    if (!PyArg_ParseTuple(args, "s#iifs",(char**)&rgb, &size, &width, &height, &quality_factor, &mode)) {
         Py_RETURN_NONE;
     }