Prevent namespace pollution, add static for internal functions
diff --git a/Objects/abstract.c b/Objects/abstract.c
index 6d948d4..83de88f 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -446,7 +446,7 @@
 }
 
 
-void
+static void
 _add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape)
 {
 	int k;
@@ -462,7 +462,7 @@
 	}
 }
 
-void
+static void
 _add_one_to_index_C(int nd, Py_ssize_t *index, Py_ssize_t *shape)
 {
 	int k;