diff --git a/appveyor.yml b/appveyor.yml
index e78617c..025e0c1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -25,7 +25,7 @@ environment:
       ADDRMD: 32,64
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: clang
-      CXXSTD: 03,11,14,17
+      CXXSTD: 14
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
       ADDPATH: C:\cygwin\bin;
       TOOLSET: gcc