diff --git a/.appveyor.yml b/.appveyor.yml
index f6f10371..72505626 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -39,12 +39,12 @@ environment:
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       PLATFORM: x64
       B2_TOOLSET: msvc-14.2
-      B2_CXXSTD: 11,14,17,20
+      B2_CXXSTD: 11,14,20 # C++17 is already tested with CMake
     - FLAVOR: Visual Studio 2019
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       PLATFORM: x86
       B2_TOOLSET: msvc-14.2
-      B2_CXXSTD: 11,14,17,20
+      B2_CXXSTD: 11,14,20 # C++17 is already tested with CMake
     # CMake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       CMAKE_BUILD_TYPE: Debug