diff -up zstandard-0.15.1/c-ext/compressionreader.c.orig zstandard-0.15.1/c-ext/compressionreader.c
--- zstandard-0.15.1/c-ext/compressionreader.c.orig	2020-12-31 23:18:06.000000000 +0000
+++ zstandard-0.15.1/c-ext/compressionreader.c	2021-03-01 11:41:09.056060857 +0000
@@ -793,7 +793,7 @@ static PyMethodDef compressionreader_met
     {NULL, NULL}};
 
 static PyMemberDef compressionreader_members[] = {
-    {"closed", T_BOOL, offsetof(ZstdCompressionReader, closed), READONLY,
+    {"closed", T_INT, offsetof(ZstdCompressionReader, closed), READONLY,
      "whether stream is closed"},
     {NULL}};
 
diff -up zstandard-0.15.1/c-ext/decompressionreader.c.orig zstandard-0.15.1/c-ext/decompressionreader.c
--- zstandard-0.15.1/c-ext/decompressionreader.c.orig	2020-12-31 23:18:06.000000000 +0000
+++ zstandard-0.15.1/c-ext/decompressionreader.c	2021-03-01 11:40:35.686060857 +0000
@@ -761,7 +761,7 @@ static PyMethodDef decompressionreader_m
     {NULL, NULL}};
 
 static PyMemberDef decompressionreader_members[] = {
-    {"closed", T_BOOL, offsetof(ZstdDecompressionReader, closed), READONLY,
+    {"closed", T_INT, offsetof(ZstdDecompressionReader, closed), READONLY,
      "whether stream is closed"},
     {NULL}};
 
diff -up zstandard-0.15.1/c-ext/compressionwriter.c.orig zstandard-0.15.1/c-ext/compressionwriter.c
--- zstandard-0.15.1/c-ext/compressionwriter.c.orig	2020-12-31 23:18:06.000000000 +0000
+++ zstandard-0.15.1/c-ext/compressionwriter.c	2021-03-01 11:50:29.546150542 +0000
@@ -323,7 +323,7 @@ static PyMethodDef ZstdCompressionWriter
     {NULL, NULL}};
 
 static PyMemberDef ZstdCompressionWriter_members[] = {
-    {"closed", T_BOOL, offsetof(ZstdCompressionWriter, closed), READONLY, NULL},
+    {"closed", T_INT, offsetof(ZstdCompressionWriter, closed), READONLY, NULL},
     {NULL}};
 
 PyTypeObject ZstdCompressionWriterType = {
diff -up zstandard-0.15.1/c-ext/decompressionwriter.c.orig zstandard-0.15.1/c-ext/decompressionwriter.c
--- zstandard-0.15.1/c-ext/decompressionwriter.c.orig	2020-12-31 23:18:06.000000000 +0000
+++ zstandard-0.15.1/c-ext/decompressionwriter.c	2021-03-01 11:49:31.386150542 +0000
@@ -243,7 +243,7 @@ static PyMethodDef ZstdDecompressionWrit
     {NULL, NULL}};
 
 static PyMemberDef ZstdDecompressionWriter_members[] = {
-    {"closed", T_BOOL, offsetof(ZstdDecompressionWriter, closed), READONLY,
+    {"closed", T_INT, offsetof(ZstdDecompressionWriter, closed), READONLY,
      NULL},
     {NULL}};