diff --git a/Objects/abstract.c b/Objects/abstract.c
index 98d2dd0..75de1aa 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -443,7 +443,7 @@
 
 
 void
-_add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape)
+_Py_add_one_to_index_F(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
 {
     int k;
 
@@ -459,7 +459,7 @@
 }
 
 void
-_add_one_to_index_C(int nd, Py_ssize_t *index, Py_ssize_t *shape)
+_Py_add_one_to_index_C(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
 {
     int k;
 
@@ -483,7 +483,7 @@
 PyBuffer_ToContiguous(void *buf, Py_buffer *view, Py_ssize_t len, char fort)
 {
     int k;
-    void (*addone)(int, Py_ssize_t *, Py_ssize_t *);
+    void (*addone)(int, Py_ssize_t *, const Py_ssize_t *);
     Py_ssize_t *indices, elements;
     char *dest, *ptr;
 
@@ -510,10 +510,10 @@
     }
 
     if (fort == 'F') {
-        addone = _add_one_to_index_F;
+        addone = _Py_add_one_to_index_F;
     }
     else {
-        addone = _add_one_to_index_C;
+        addone = _Py_add_one_to_index_C;
     }
     dest = buf;
     /* XXX : This is not going to be the fastest code in the world
@@ -534,7 +534,7 @@
 PyBuffer_FromContiguous(Py_buffer *view, void *buf, Py_ssize_t len, char fort)
 {
     int k;
-    void (*addone)(int, Py_ssize_t *, Py_ssize_t *);
+    void (*addone)(int, Py_ssize_t *, const Py_ssize_t *);
     Py_ssize_t *indices, elements;
     char *src, *ptr;
 
@@ -561,10 +561,10 @@
     }
 
     if (fort == 'F') {
-        addone = _add_one_to_index_F;
+        addone = _Py_add_one_to_index_F;
     }
     else {
-        addone = _add_one_to_index_C;
+        addone = _Py_add_one_to_index_C;
     }
     src = buf;
     /* XXX : This is not going to be the fastest code in the world
@@ -641,7 +641,7 @@
         elements *= view_src.shape[k];
     }
     while (elements--) {
-        _add_one_to_index_C(view_src.ndim, indices, view_src.shape);
+        _Py_add_one_to_index_C(view_src.ndim, indices, view_src.shape);
         dptr = PyBuffer_GetPointer(&view_dest, indices);
         sptr = PyBuffer_GetPointer(&view_src, indices);
         memcpy(dptr, sptr, view_src.itemsize);