diff --git a/paddle/operators/nccl_op_test.cu.cc b/paddle/operators/nccl_op_test.cu.cc
index 6546096069d4c3fbc4908a16c2dba2ac6d7e6421..072e4eb2eff1f6f3d8745ac8e16709b8e1a69725 100644
--- a/paddle/operators/nccl_op_test.cu.cc
+++ b/paddle/operators/nccl_op_test.cu.cc
@@ -241,7 +241,7 @@ TEST_F(NCCLTester, ncclReduceOp) {
 // ncclBcastOp with desc
 TEST_F(NCCLTester, ncclBcastOp) {
   std::unique_ptr<f::OpDesc> op2(new f::OpDesc);
-  const int kRoot = 5;
+  const int kRoot = 0;
   op2->SetType("ncclBcast");
   op2->SetInput("X", {"st"});
   op2->SetInput("Communicator", {"comm"});