diff --git a/py/sift.spec b/py/sift.spec
index 5cece6fdd2bfc083d7b30dca17342cc1cae0761b..61348e25d425d1a3d56aceaa3bb8d765413d0271 100755
--- a/py/sift.spec
+++ b/py/sift.spec
@@ -19,7 +19,7 @@ a = Analysis(['cspov\\__main__.py'],
              pathex=['Z:\\repos\\repos\\git\\CSPOV\\py'],
              binaries=None,
              datas=data_files,
-             hiddenimports=["vispy.app.backends._pyqt4", "PyQt4.QtNetwork", "scipy.linalg", "scipy.linalg.cython_blas", "scipy.linalg.cython_lapack", "scipy.integrate"],
+             hiddenimports=["vispy.ext._bundled.six", "vispy.app.backends._pyqt4", "PyQt4.QtNetwork", "scipy.linalg", "scipy.linalg.cython_blas", "scipy.linalg.cython_lapack", "scipy.integrate"],
              hookspath=None,
              runtime_hooks=None,
              excludes=["tkinter"],