diff --git a/test/06_docker_images/setup.py b/test/06_docker_images/setup.py
index 75b922a6..d341d5ff 100644
--- a/test/06_docker_images/setup.py
+++ b/test/06_docker_images/setup.py
@@ -5,7 +5,7 @@ from setuptools import setup, Extension
 if sys.argv[-1] != '--name':
     # check that we're running in the correct docker image as specified in the
     # environment options CIBW_MANYLINUX1_*_IMAGE
-    if not os.path.exists('/dockcross'):
+    if 'linux' in sys.platform and not os.path.exists('/dockcross'):
         raise Exception('/dockcross directory not found. Is this test running in the correct docker image?')
 
 setup(