diff --git a/excalibur/executors/celery_executor.py b/excalibur/executors/celery_executor.py
index bb26429..d111ee2 100755
--- a/excalibur/executors/celery_executor.py
+++ b/excalibur/executors/celery_executor.py
@@ -1,5 +1,6 @@
 import traceback
 import subprocess
+import sys
 
 from celery import Celery
 
@@ -22,7 +23,7 @@
 @app.task
 def execute_command(command):
     try:
-        subprocess.check_call(command, stderr=subprocess.STDOUT, close_fds=True)
+        subprocess.check_call(command, stderr=subprocess.STDOUT, close_fds=(sys.platform != 'win32'))
     except Exception as e:
         traceback.print_exc(e)
 
diff --git a/excalibur/executors/sequential_executor.py b/excalibur/executors/sequential_executor.py
index cc5c45a..4e758c2 100644
--- a/excalibur/executors/sequential_executor.py
+++ b/excalibur/executors/sequential_executor.py
@@ -1,13 +1,14 @@
 import traceback
 import subprocess
 from concurrent.futures import ProcessPoolExecutor
+import sys
 
 from .base_executor import BaseExecutor
 
 
 def execute_command(command):
     try:
-        subprocess.check_call(command, stderr=subprocess.STDOUT, close_fds=True)
+        subprocess.check_call(command, stderr=subprocess.STDOUT, close_fds=(sys.platform != 'win32'))
     except FileNotFoundError:
         # TODO: PyInstaller does not package console_scripts
         # https://github.com/pyinstaller/pyinstaller/issues/305