diff --git a/pre_commit/languages/node.py b/pre_commit/languages/node.py
index 69378b06..9110a3a9 100644
--- a/pre_commit/languages/node.py
+++ b/pre_commit/languages/node.py
@@ -19,8 +19,8 @@ healthy = helpers.basic_healthy
 def get_env_patch(venv):  # pragma: windows no cover
     return (
         ('NODE_VIRTUAL_ENV', venv),
-        ('NPM_CONFIG_PREFIX', venv),
-        ('npm_config_prefix', venv),
+        ('NPM_CONFIG_PREFIX', os.path.join(venv, 'bin') if sys.platform == 'cygwin' else venv),
+        ('npm_config_prefix', os.path.join(venv, 'bin') if sys.platform == 'cygwin' else venv),
         ('NODE_PATH', os.path.join(venv, 'lib', 'node_modules')),
         ('PATH', (os.path.join(venv, 'bin'), os.pathsep, Var('PATH'))),
     )