diff --git a/appveyor.yml b/appveyor.yml
index 9681a603e..1b25dcad4 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -26,8 +26,7 @@ install:
   - cmd: set BOOST_ROOT=C:\Libraries\boost_1_71_0
   # build wxWidgets
   - cmd: chdir %WXWIN%\build\msw
-  - cmd: nmake -f makefile.vc BUILD=debug
-  - cmd: nmake -f makefile.vc BUILD=release
+  - cmd: nmake -f makefile.vc BUILD=release COMPILER_PREFIX=vc14x
   - cmd: chdir %APPVEYOR_BUILD_FOLDER%
 
 build_script: