@@ -75,6 +75,7 @@ build_script:
 # to run your custom scripts instead of automatic tests
 test_script:
   - set DLR_BIN=%APPVEYOR_BUILD_FOLDER%\bin\%CONFIGURATION%
+  - "%SystemRoot%\Microsoft.NET\Framework\v4.0.30319\ngen.exe" install "%DLR_BIN%\ipy.exe"
   - make testall
   #- Test\test-ipy-tc.cmd /category:Languages\IronPython\IronPython\2.X
 