--- a/contrib/python-zstandard/c-ext/decompressor.c	Sat Aug 17 01:49:28 2019 +0530
+++ b/contrib/python-zstandard/c-ext/decompressor.c	Sun Aug 25 09:00:26 2019 -0700
@@ -68,13 +68,13 @@
 	};
 
 	ZstdCompressionDict* dict = NULL;
-	size_t maxWindowSize = 0;
+	Py_ssize_t maxWindowSize = 0;
 	ZSTD_format_e format = ZSTD_f_zstd1;
 
 	self->dctx = NULL;
 	self->dict = NULL;
 
-	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O!II:ZstdDecompressor", kwlist,
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O!nI:ZstdDecompressor", kwlist,
 		&ZstdCompressionDictType, &dict, &maxWindowSize, &format)) {
 		return -1;
 	}