diff --git a/pythontex/pythontex_utils.py b/pythontex/pythontex_utils.py
index 2731e7a..68fbd5a 100644
--- a/pythontex/pythontex_utils.py
+++ b/pythontex/pythontex_utils.py
@@ -228,7 +228,7 @@ def _set_sympy_latex(style, **kwargs):
             
     # Finally, create the actual interface to SymPy's LatexPrinter
     def _make_sympy_latex(self):
-        '''
+        r'''
         Create a context-aware interface to SymPy's LatexPrinter class.
         
         This is an interface to the LatexPrinter class, rather than