Index: src/sqliteInt.h
==================================================================
--- src/sqliteInt.h
+++ src/sqliteInt.h
@@ -2248,11 +2248,11 @@
 #define WHERE_ONEPASS_DESIRED  0x0004 /* Want to do one-pass UPDATE/DELETE */
 #define WHERE_DUPLICATES_OK    0x0008 /* Ok to return a row more than once */
 #define WHERE_OMIT_OPEN_CLOSE  0x0010 /* Table cursors are already open */
 #define WHERE_FORCE_TABLE      0x0020 /* Do not use an index-only search */
 #define WHERE_ONETABLE_ONLY    0x0040 /* Only code the 1st table in pTabList */
-                          /*   0x0080 // not currently used */
+#define WHERE_NO_AUTOINDEX     0x0080 /* Disallow automatic indexes */
 #define WHERE_GROUPBY          0x0100 /* pOrderBy is really a GROUP BY */
 #define WHERE_DISTINCTBY       0x0200 /* pOrderby is really a DISTINCT clause */
 #define WHERE_WANT_DISTINCT    0x0400 /* All output needs to be distinct */
 #define WHERE_SORTBYGROUP      0x0800 /* Support sqlite3WhereIsSorted() */
 #define WHERE_REOPEN_IDX       0x1000 /* Try to use OP_ReopenIdx */

Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -3612,11 +3612,12 @@
     ** eliminating duplicates from other WHERE clauses, the action for each
     ** sub-WHERE clause is to to invoke the main loop body as a subroutine.
     */
     wctrlFlags =  WHERE_OMIT_OPEN_CLOSE
                 | WHERE_FORCE_TABLE
-                | WHERE_ONETABLE_ONLY;
+                | WHERE_ONETABLE_ONLY
+                | WHERE_NO_AUTOINDEX;
     for(ii=0; ii<pOrWc->nTerm; ii++){
       WhereTerm *pOrTerm = &pOrWc->a[ii];
       if( pOrTerm->leftCursor==iCur || (pOrTerm->eOperator & WO_AND)!=0 ){
         WhereInfo *pSubWInfo;           /* Info for single OR-term scan */
         Expr *pOrExpr = pOrTerm->pExpr; /* Current OR clause term */
@@ -4806,10 +4807,11 @@
   rLogSize = estLog(rSize);
 
 #ifndef SQLITE_OMIT_AUTOMATIC_INDEX
   /* Automatic indexes */
   if( !pBuilder->pOrSet
+   && (pWInfo->wctrlFlags & WHERE_NO_AUTOINDEX)==0
    && (pWInfo->pParse->db->flags & SQLITE_AutoIndex)!=0
    && pSrc->pIndex==0
    && !pSrc->viaCoroutine
    && !pSrc->notIndexed
    && HasRowid(pTab)