Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -2266,11 +2266,11 @@
   WhereLoop *pLoop,      /* The loop to adjust downward */
   LogEst nRow            /* Number of rows in the entire table */
 ){
   WhereTerm *pTerm, *pX;
   Bitmask notAllowed = ~(pLoop->prereq|pLoop->maskSelf);
-  int i, j, k;
+  int i, j;
   LogEst iReduce = 0;    /* pLoop->nOut should not exceed nRow-iReduce */
 
   assert( (pLoop->wsFlags & WHERE_AUTO_INDEX)==0 );
   for(i=pWC->nTerm, pTerm=pWC->a; i>0; i--, pTerm++){
     assert( pTerm!=0 );
@@ -2292,10 +2292,11 @@
         /* In the absence of explicit truth probabilities, use heuristics to
         ** guess a reasonable truth probability. */
         pLoop->nOut--;
         if( pTerm->eOperator&(WO_EQ|WO_IS) ){
           Expr *pRight = pTerm->pExpr->pRight;
+          int k = 0;
           testcase( pTerm->pExpr->op==TK_IS );
           if( sqlite3ExprIsInteger(pRight, &k) && k>=(-1) && k<=1 ){
             k = 10;
           }else{
             k = 20;