diff --git a/appveyor.yml b/appveyor.yml
index 02b6a9b..510bd41 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -30,7 +30,12 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       TOOLSET: clang-win
       ADDRMD: 64
-      CXXSTD: 14,17,20,latest
+      CXXSTD: 14,17
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: clang-win
+      ADDRMD: 64
+      CXXSTD: 20,latest
 
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;