diff --git a/appveyor.yml b/appveyor.yml
index a3441bbd5..f8d7ee1e0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -26,7 +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=release COMPILER_PREFIX=vc142
+  - cmd: nmake -f makefile.vc BUILD=release COMPILER_PREFIX=vc142 SHARED=1
   - cmd: dir %WXWIN%\lib
   - cmd: dir %WXWIN%\lib\vc142_x64_dll
   - cmd: chdir %APPVEYOR_BUILD_FOLDER%