diff -r 89742f1fa6cb -r 73fef626dae3 contrib/python-zstandard/c-ext/decompressor.c
--- a/contrib/python-zstandard/c-ext/decompressor.c	Tue Sep 25 20:55:03 2018 +0900
+++ b/contrib/python-zstandard/c-ext/decompressor.c	Mon Oct 08 16:27:40 2018 -0700
@@ -575,6 +575,10 @@
 		return NULL;
 	}
 
+	if (ensure_dctx(self, 1)) {
+		return NULL;
+	}
+
 	result = (ZstdDecompressionReader*)PyObject_CallObject((PyObject*)&ZstdDecompressionReaderType, NULL);
 	if (NULL == result) {
 		return NULL;