Index: src/vdbesort.c
==================================================================
--- src/vdbesort.c
+++ src/vdbesort.c
@@ -599,15 +599,16 @@
 ** Or, if an error occurs, return an SQLite error code. The final value of
 ** *pp is undefined in this case.
 */
 static int vdbeSorterMapFile(SortSubtask *pTask, SorterFile *pFile, u8 **pp){
   int rc = SQLITE_OK;
-  if( pFile->iEof<=(i64)(pTask->pSorter->db->nMaxSorterMmap)
-   && pFile->pFd->pMethods->xFetch 
-  ){
-    rc = sqlite3OsFetch(pFile->pFd, 0, (int)pFile->iEof, (void**)pp);
-    testcase( rc!=SQLITE_OK );
+  if( pFile->iEof<=(i64)(pTask->pSorter->db->nMaxSorterMmap) ){
+    sqlite3_file *pFd = pFile->pFd;
+    if( pFd->pMethods->iVersion>=3 ){
+      rc = sqlite3OsFetch(pFd, 0, (int)pFile->iEof, (void**)pp);
+      testcase( rc!=SQLITE_OK );
+    }
   }
   return rc;
 }
 
 /*
@@ -1123,11 +1124,11 @@
 ** the specific VFS implementation.
 */
 static void vdbeSorterExtendFile(sqlite3 *db, sqlite3_file *pFd, i64 nByte){
   if( nByte<=(i64)(db->nMaxSorterMmap) ){
     int rc = sqlite3OsTruncate(pFd, nByte);
-    if( rc==SQLITE_OK && pFd->pMethods->xFetch ){
+    if( rc==SQLITE_OK && pFd->pMethods->iVersion>=3 ){
       void *p = 0;
       sqlite3OsFetch(pFd, 0, (int)nByte, &p);
       sqlite3OsUnfetch(pFd, 0, p);
     }
   }

ADDED   test/sort5.test
Index: test/sort5.test
==================================================================
--- test/sort5.test
+++ test/sort5.test
@@ -0,0 +1,45 @@
+# 2014 September 15.
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library. 
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix sort5
+
+
+#-------------------------------------------------------------------------
+# Verify that sorting works with a version 1 sqlite3_io_methods structure.
+#
+testvfs tvfs -iversion 1 -default true
+reset_db
+do_execsql_test 1.0 {
+  PRAGMA mmap_size = 10000000;
+  PRAGMA cache_size = 10;
+  CREATE TABLE t1(a, b);
+} {0}
+
+do_test 1.1 {
+  execsql BEGIN
+  for {set i 0} {$i < 2000} {incr i} {
+    execsql { INSERT INTO t1 VALUES($i, randomblob(2000)) }
+  }
+  execsql COMMIT
+} {}
+
+do_execsql_test 1.2 {
+  CREATE INDEX i1 ON t1(b);
+}
+
+db close
+tvfs delete
+finish_test
+