diff --git a/tikv-client/src/main/java/com/pingcap/tikv/region/RegionManager.java b/tikv-client/src/main/java/com/pingcap/tikv/region/RegionManager.java
index 32ffda2080..5888aed055 100644
--- a/tikv-client/src/main/java/com/pingcap/tikv/region/RegionManager.java
+++ b/tikv-client/src/main/java/com/pingcap/tikv/region/RegionManager.java
@@ -124,7 +124,8 @@ public Pair<TiRegion, Store> getRegionStorePairByKey(
       // select a tiflash with Round-Robin strategy
       if (tiflashStores.size() > 0) {
         store =
-            tiflashStores.get(Math.abs(tiflashStoreIndex.getAndIncrement() % tiflashStores.size()));
+            tiflashStores.get(
+                Math.floorMod(tiflashStoreIndex.getAndIncrement(), tiflashStores.size()));
       }
 
       if (store == null) {