@@ -75,7 +75,8 @@ build_script:
 # to run your custom scripts instead of automatic tests
 test_script:
   - set DLR_BIN=%APPVEYOR_BUILD_FOLDER%\bin\%CONFIGURATION%
-  - ngen.exe install %DLR_BIN%\\ipy.exe
+  - %SystemRoot%\Microsoft.NET\Framework\v4.0.30319\ngen.exe install %DLR_BIN%\ipy.exe
+  - %SystemRoot%\Microsoft.NET\Framework\v4.0.30319\ngen.exe install %DLR_BIN%\*.dll
   - make testall
   #- Test\test-ipy-tc.cmd /category:Languages\IronPython\IronPython\2.X
 