diff --git a/build/appveyor/MSVC-appveyor-build.bat b/build/appveyor/MSVC-appveyor-build.bat
index 892daa1..3d2bbee 100644
--- a/build/appveyor/MSVC-appveyor-build.bat
+++ b/build/appveyor/MSVC-appveyor-build.bat
@@ -51,8 +51,7 @@
     -DOPENSSL_USE_STATIC_LIBS=OFF ^
     -DZLIB_LIBRARY="%WIN3P%\zlib-inst\lib\zlib%ZLIB_LIB_SUFFIX%.lib" ^
     -DZLIB_ROOT="%WIN3P%\zlib-inst" ^
-    -DWITH_PYTHON=%WITH_PYTHON% ^
-    -DWITH_%THREADMODEL%THREADS=ON          || EXIT /B
+    -DWITH_PYTHON=%WITH_PYTHON%             || EXIT /B
 @ECHO OFF
 
 cmake --build . ^
diff --git a/build/appveyor/cl_setenv.bat b/build/appveyor/cl_setenv.bat
index da4d4ee..98931a6 100644
--- a/build/appveyor/cl_setenv.bat
+++ b/build/appveyor/cl_setenv.bat
@@ -52,8 +52,6 @@
   SET OPENSSL_ROOT=C:\OpenSSL-Win%NORM_PLATFORM%
   SET WIN3P=%APPVEYOR_BUILD_FOLDER%\thirdparty
 
-  SET THREADMODEL=STD
-
   IF "%PYTHON_VERSION%" == "" (
     SET WITH_PYTHON=OFF
   ) ELSE (