diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index e54642696daeee..c53c0285e70147 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -22,8 +22,8 @@
 json_data_file = os.path.join(script_dir, 'win_toolchain.json')
 
 
-# Use MSVS2017 as the default toolchain.
-CURRENT_DEFAULT_TOOLCHAIN_VERSION = '2017'
+# Use MSVS2015 as the default toolchain.
+CURRENT_DEFAULT_TOOLCHAIN_VERSION = '2015'
 
 
 def SetEnvironmentAndGetRuntimeDllDirs():