From b93cc567325a4a9b43ccc3afff48631b9b181329 Mon Sep 17 00:00:00 2001
From: George Wu <uiharu@buaa.edu.cn>
Date: Thu, 16 Apr 2020 12:21:09 +0200
Subject: [PATCH] Why, MSVC?

---
 appveyor.yml              | 2 +-
 src/apps/common/utils.cpp | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/appveyor.yml b/appveyor.yml
index 5c28dbd..73feaa7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: '0.3.4.{build}'
+version: '0.3.5.{build}'
 environment:
   matrix:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
diff --git a/src/apps/common/utils.cpp b/src/apps/common/utils.cpp
index 5f8144e..5b93f83 100644
--- a/src/apps/common/utils.cpp
+++ b/src/apps/common/utils.cpp
@@ -29,8 +29,9 @@ string common_utils::ReplaceExtension(const string &s, const string &oldExt, con
     // extensions are in ASCII, and we don't care about chars before the extension,
     // we can use this method (tolower()). Otherwise, it causes trouble for non-
     // ASCII encodings.
-    std::transform(sl.begin(), sl.end(), sl.begin(), std::tolower);
-    std::transform(extl.begin(), extl.end(), extl.begin(), std::tolower);
+    // Until VS 2019, tolower() is not present in std namespace.
+    std::transform(sl.begin(), sl.end(), sl.begin(), ::tolower);
+    std::transform(extl.begin(), extl.end(), extl.begin(), ::tolower);
 
     if (!hasEnding(sl, extl)) {
         return s;