diff --git a/.github/workflows/develop.yml b/.github/workflows/develop.yml
index 7ec0b638..80bc24b1 100644
--- a/.github/workflows/develop.yml
+++ b/.github/workflows/develop.yml
@@ -8,7 +8,7 @@ jobs:
   develop:
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest]
+        os: [macos-latest, ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
diff --git a/pywasm/__init__.py b/pywasm/__init__.py
index 3397078f..e6813f11 100644
--- a/pywasm/__init__.py
+++ b/pywasm/__init__.py
@@ -1,6 +1,9 @@
+import platform
+
 from . import core
 from . import leb128
 from . import log
 from . import opcode
-from . import wasi
+if platform.system().lower() in ['darwin', 'linux']:
+    from . import wasi
 from .core import *
diff --git a/pywasm/wasi.py b/pywasm/wasi.py
index d6b3c11f..0b7b2f52 100644
--- a/pywasm/wasi.py
+++ b/pywasm/wasi.py
@@ -1,4 +1,5 @@
 import dataclasses
+import fcntl
 import os
 import pywasm.core
 import random
@@ -654,24 +655,17 @@ def fd_fdstat_set_flags(self, _: pywasm.core.Machine, args: typing.List[int]) ->
         if file.wasm_flag ^ args[1] | fyes != fyes:
             # Only support changing the NONBLOCK or APPEND flags.
             return [self.ERRNO_INVAL]
-        host_flag = file.host_flag
-        host_flag &= ~os.O_APPEND
-        host_flag &= ~os.O_APPEND
-        wasm_flag = file.wasm_flag
-        wasm_flag &= ~self.FDFLAGS_APPEND
-        wasm_flag &= ~self.FDFLAGS_NONBLOCK
+        file.host_flag &= ~os.O_APPEND
+        file.host_flag &= ~os.O_APPEND
+        file.wasm_flag &= ~self.FDFLAGS_APPEND
+        file.wasm_flag &= ~self.FDFLAGS_NONBLOCK
         if args[1] & self.FDFLAGS_APPEND:
-            host_flag |= os.O_APPEND
-            wasm_flag |= self.FDFLAGS_APPEND
+            file.host_flag |= os.O_APPEND
+            file.wasm_flag |= self.FDFLAGS_APPEND
         if args[1] & self.FDFLAGS_NONBLOCK:
-            host_flag |= os.O_NONBLOCK
-            wasm_flag |= self.FDFLAGS_NONBLOCK
-        ocur = os.lseek(file.host_fd, 0, os.SEEK_CUR)
-        os.close(file.host_fd)
-        file.host_fd = os.open(file.host_name, host_flag)
-        os.lseek(file.host_fd, ocur, os.SEEK_SET)
-        file.host_flag = host_flag
-        file.wasm_flag = wasm_flag
+            file.host_flag |= os.O_NONBLOCK
+            file.wasm_flag |= self.FDFLAGS_NONBLOCK
+        fcntl.fcntl(file.host_fd, fcntl.F_SETFL, file.host_flag)
         return [self.ERRNO_SUCCESS]
 
     def fd_fdstat_set_rights(self, _: pywasm.core.Machine, args: typing.List[int]) -> typing.List[int]:
diff --git a/test/wasi.py b/test/wasi.py
index f3ac4dce..64734a08 100644
--- a/test/wasi.py
+++ b/test/wasi.py
@@ -3,17 +3,13 @@
 import io
 import json
 import os
+import platform
 import pywasm
 import shutil
-import subprocess
+import sys
 import typing
 
 
-def call(cmd: str) -> subprocess.CompletedProcess[bytes]:
-    print(f'$ {cmd}')
-    return subprocess.run(cmd, shell=True, check=True)
-
-
 @contextlib.contextmanager
 def cd(dst: str) -> typing.Generator[None, typing.Any, None]:
     cwd = os.getcwd()
@@ -22,6 +18,9 @@ def cd(dst: str) -> typing.Generator[None, typing.Any, None]:
     os.chdir(cwd)
 
 
+if platform.system().lower() in ['windows']:
+    sys.exit(0)
+
 with cd('res/wasi-testsuite'):
     for e in glob.glob('**/*/*.cleanup', recursive=True):
         if os.path.islink(e):