diff --git a/nodeenv.py b/nodeenv.py
index e4bf509..4b6a09a 100644
--- a/nodeenv.py
+++ b/nodeenv.py
@@ -26,6 +26,7 @@
 import zipfile
 import shutil
 import glob
+import psutil
 
 try:  # pragma: no cover (py2 only)
     from ConfigParser import SafeConfigParser as ConfigParser
@@ -52,8 +53,16 @@
 if is_PY3:
     from functools import cmp_to_key
 
-is_WIN = platform.system() == 'Windows'
 is_CYGWIN = platform.system().startswith('CYGWIN')
+if platform.system() == 'Windows':
+    is_WIN = True
+    # if a bash terminal is used in the process of activating this script, install as CYGWIN
+    proc_parent = psutil.Process(os.getpid()).parent()
+    while proc_parent is not None and proc_parent.name() != 'bash.exe':
+        proc_parent = proc_parent.parent()
+    if proc_parent is not None and proc_parent.name() == 'bash.exe':
+        is_WIN = False
+        is_CYGWIN = True
 
 
 # ---------------------------------------------------------
diff --git a/setup.py b/setup.py
index 2c1ff5d..2e03d98 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,9 @@ def read_file(file_name):
     license='BSD',
     author='Eugene Kalinin',
     author_email='e.v.kalinin@gmail.com',
-    install_requires=[],
+    install_requires=[
+        'psutil'
+    ],
     description="Node.js virtual environment builder",
     long_description=ldesc,
     py_modules=['nodeenv'],