Correct target name of build toolset
diff --git a/.appveyor.yml b/.appveyor.yml
index 485b677..c5d2b31 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -9,7 +9,7 @@
   - debug
 
 before_build:
-  - cmake -G "Visual Studio 16 2019 Win64"
+  - cmake -G "Visual Studio 16 2019"
 
 build:
   project: (APPVEYOR_BUILD_FOLDER)\$(APPVEYOR_PROJECT_NAME).sln