diff --git a/statistics/index.go b/statistics/index.go
index d201aa8fdd14f..40ba2b005843b 100644
--- a/statistics/index.go
+++ b/statistics/index.go
@@ -298,7 +298,7 @@ func (idx *Index) GetRowCount(sctx sessionctx.Context, coll *HistColl, indexRang
 				if expBackoffCnt > upperLimit {
 					expBackoffCnt = upperLimit
 				}
-				totalCount += expBackoffCnt
+				count += expBackoffCnt
 			}
 		}
 		if !expBackoffSuccess {
@@ -310,7 +310,7 @@ func (idx *Index) GetRowCount(sctx sessionctx.Context, coll *HistColl, indexRang
 
 		// handling the out-of-range part
 		if (idx.outOfRange(l) && !(isSingleCol && lowIsNull)) || idx.outOfRange(r) {
-			totalCount += idx.Histogram.outOfRangeRowCount(&l, &r, modifyCount)
+			count += idx.Histogram.outOfRangeRowCount(&l, &r, modifyCount)
 		}
 		totalCount += count
 	}