diff --git a/wxPython/wxPython/lib/vtk.py b/wxPython/wxPython/lib/vtk.py
index ad784dba0b..7d986a8bbc 100644
--- a/wxPython/wxPython/lib/vtk.py
+++ b/wxPython/wxPython/lib/vtk.py
@@ -52,14 +52,14 @@ def debug(msg):
 
 
 class wxVTKRenderWindowBase(wxWindow):
-    """
+    '''
     A base class that enables one to embed a vtkRenderWindow into
     a wxPython widget.  This class embeds the RenderWindow correctly
     under different platforms.  Provided are some empty methods that
     can be overloaded to provide a user defined interaction behaviour.
     The event handling functions have names that are similar to the
     ones in the vtkInteractorStyle class included with VTK.
-    """
+    '''
 
     def __init__(self, parent, id, position=wxDefaultPosition,
                  size=wxDefaultSize, style=0):