diff --git a/Xdmf.i b/Xdmf.i
index 21296f0a541fab5ba1655bdcac886703f680441d..9ab4344e11858a4a5f86fb8232241c2181fdf7e0 100644
--- a/Xdmf.i
+++ b/Xdmf.i
@@ -17,8 +17,6 @@ swig -v -c++ -python -o XdmfPython.cpp Xdmf.i
 
 %module Xdmf
 %{
-    #define SWIGPY_SLICE_ARG(obj) ((PySliceObject*) (obj))
-
     // MPI Includes
     #include <mpi.h>
 
@@ -81,8 +79,6 @@ swig -v -c++ -python -o XdmfPython.cpp Xdmf.i
 #else
 %module Xdmf
 %{
-    #define SWIGPY_SLICE_ARG(obj) ((PySliceObject*) (obj))
-
     // XdmfCore Includes
     #include <Xdmf.hpp>
     #include <XdmfArray.hpp>