From 6c7c4333f83b43de3c4cd6813cf6433bb563b56f Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Wed, 9 Aug 2017 16:05:22 +0800
Subject: [PATCH] Fix TravisCI test

---
 paddle/framework/backward.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/paddle/framework/backward.cc b/paddle/framework/backward.cc
index be6656792f..437a44a8aa 100644
--- a/paddle/framework/backward.cc
+++ b/paddle/framework/backward.cc
@@ -133,8 +133,9 @@ std::shared_ptr<OperatorBase> BackwardRecursive(
     std::shared_ptr<OperatorBase> grad_op = OpRegistry::CreateGradOp(forwardOp);
     for (std::string& grad_input : grad_op->inputs_) {
       if (no_grad_names.count(grad_input)) {
+        // +1 for \0
         std::string prefix = grad_input.substr(
-            0, grad_input.size() - sizeof(kGradVarSuffix) / sizeof(char));
+            0, grad_input.size() - sizeof(kGradVarSuffix) / sizeof(char) + 1);
         grad_input = prefix + kZeroVarSuffix;
 
         // If part of input gradient of that operator is not calculated, fill
-- 
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