diff --git a/bindings/python/mapnik_envelope.cpp b/bindings/python/mapnik_envelope.cpp
index edef9cccb..79c0fe1e5 100644
--- a/bindings/python/mapnik_envelope.cpp
+++ b/bindings/python/mapnik_envelope.cpp
@@ -264,7 +264,6 @@ void export_envelope()
         .def(self == self) // __eq__
         .def(self != self) // __neq__
         .def(self + self)  // __add__
-        //.def(self - self)  // __sub__
         .def(self * float()) // __mult__
         .def(float() * self) 
         .def(self / float()) // __div__