diff --git a/appveyor.yml b/appveyor.yml
index d8bb5c9..c4692f1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -94,7 +94,8 @@ test_script:
   - if "%UBP%" == "" SET UBP=0
   - if "%STAGE%" == "" SET CMAKE_INSTALL=-DCMAKE_INSTALL_PREFIX=C:\projects\.local
   - if NOT "%STAGE%" == "" SET CMAKE_INSTALL=-DUSE_STAGED_BOOST=1
-  - cmake -DUSE_BOOST_PACKAGE=%UBP% -DBoost_VERBOSE=ON %CMAKE_INSTALL% ..
+  - if NOT "%USE_PYTHON_VERSION%" == "" SET USE_PYTHON_VERSION=-DUSE_PYTHON_VERSION=%USE_PYTHON_VERSION%
+  - cmake -DUSE_BOOST_PACKAGE=%UBP% -DBoost_VERBOSE=ON %USE_PYTHON_VERSION% %CMAKE_INSTALL% ..
   - PATH %PATH%;C:\projects\.local\lib
   - cmake --build . --config Debug && cmake --build . --config Debug --target check
   - cmake --build . --config Release && cmake --build . --config Release --target check