diff --git a/scripts/build-appveyor.bat b/scripts/build-appveyor.bat
index 5edbc6ad1..b395e1abb 100644
--- a/scripts/build-appveyor.bat
+++ b/scripts/build-appveyor.bat
@@ -6,6 +6,7 @@ ECHO =========== %~f0 ===========
 
 SET BUILD_TYPE=%configuration%
 SET BUILDPLATFORM=%platform%
+SET TOOLS_VERSION=%msvs_toolset%.0
 
 SET PATH=C:\Python27;%PATH%
 SET PATH=C:\Program Files\7-Zip;%PATH%