diff --git a/setup/installer/windows/notes.rst b/setup/installer/windows/notes.rst
index 2e9dde1c61..d38f5b8c36 100644
--- a/setup/installer/windows/notes.rst
+++ b/setup/installer/windows/notes.rst
@@ -365,7 +365,7 @@ Install as normal using installer at http://www.lfd.uci.edu/~gohlke/pythonlibs/
 
 Test it on the target system with
 
-calibre-debug -c "import _imaging, _imagingmath, _imagingft, _imagingcms"
+calibre-debug -c "from PIL import _imaging, _imagingmath, _imagingft, _imagingcms"
 
 
 kdewin32-msvc
diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index add1b7d6cc..0c5b430017 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -74,7 +74,8 @@ def test_imaging():
         print ('ImageMagick OK!')
     else:
         raise RuntimeError('ImageMagick choked!')
-    from PIL import Image
+    from PIL import Image, _imaging, _imagingmath, _imagingft, _imagingcms
+    _imaging, _imagingmath, _imagingft, _imagingcms
     i = Image.open(cStringIO.StringIO(data))
     if i.size < (20, 20):
         raise RuntimeError('PIL choked!')