Index: subversion/libsvn_fs_base/tree.c
===================================================================
--- subversion/libsvn_fs_base/tree.c	(revision 11963)
+++ subversion/libsvn_fs_base/tree.c	(working copy)
@@ -4176,7 +4176,7 @@
 }
 
 
-static history_vtable_t history_vtable = {
+static const history_vtable_t history_vtable = {
   base_history_prev,
   base_history_location
 };
@@ -4214,7 +4214,7 @@
 /* Creating root objects.  */
 
 
-static root_vtable_t root_vtable = {
+static const root_vtable_t root_vtable = {
   base_paths_changed,
   base_check_path,
   base_node_history,
Index: subversion/libsvn_fs/fs-loader.h
===================================================================
--- subversion/libsvn_fs/fs-loader.h	(revision 11963)
+++ subversion/libsvn_fs/fs-loader.h	(working copy)
@@ -333,7 +333,7 @@
   svn_revnum_t rev;
 
   /* FSAP-specific vtable and private data */
-  root_vtable_t *vtable;
+  const root_vtable_t *vtable;
   void *fsap_data;
 };
 
@@ -341,7 +341,7 @@
 struct svn_fs_history_t
 {
   /* FSAP-specific vtable and private data */
-  history_vtable_t *vtable;
+  const history_vtable_t *vtable;
   void *fsap_data;
 };
 
Index: subversion/libsvn_fs_fs/tree.c
===================================================================
--- subversion/libsvn_fs_fs/tree.c	(revision 11963)
+++ subversion/libsvn_fs_fs/tree.c	(working copy)
@@ -3231,7 +3231,7 @@
   return SVN_NO_ERROR;
 }
 
-static history_vtable_t history_vtable = {
+static const history_vtable_t history_vtable = {
   fs_history_prev,
   fs_history_location
 };
@@ -3265,7 +3265,7 @@
 }
 
 /* The vtable associated with root objects. */
-static root_vtable_t root_vtable = {
+static const root_vtable_t root_vtable = {
   fs_paths_changed,
   fs_check_path,
   fs_node_history,