--- src/C/sparse.c.orig	2020-04-17 00:40:51.000000000 -0600
+++ src/C/sparse.c	2020-12-24 11:13:50.665248878 -0700
@@ -49,7 +49,7 @@ extern matrix * Matrix_NewFromMatrix(mat
 extern matrix * Matrix_NewFromSequence(PyObject *, int) ;
 extern matrix * Matrix_NewFromPyBuffer(PyObject *, int, int *) ;
 extern matrix * Matrix_NewFromNumber(int , int , int , void *, int ) ;
-extern matrix * create_indexlist(int, PyObject *) ;
+extern matrix * create_indexlist(int_t, PyObject *) ;
 extern matrix * Matrix_New(int, int, int) ;
 extern matrix * dense(spmatrix *) ;
 extern PyObject * matrix_add(PyObject *, PyObject *) ;