diff --git a/src/dtkImagingCore/dtkImagingCore.i b/src/dtkImagingCore/dtkImagingCore.i
index 3120b6ef1167d0d78cf8293af05f7fbeb68155d8..e379d24623e47f84e31fe95005f2528eb5912af7 100644
--- a/src/dtkImagingCore/dtkImagingCore.i
+++ b/src/dtkImagingCore/dtkImagingCore.i
@@ -49,7 +49,6 @@ import_array();
 %feature("director");
 
 %inline %{
-    typedef long unsigned int size_t;
     static std::unordered_map<int, int> type_to_numpy_type = {
                                                            {qMetaTypeId<          bool>(), NPY_BOOL},
                                                            {qMetaTypeId<unsigned  char>(), NPY_UBYTE},