diff --git a/appveyor.yml b/appveyor.yml
index 6be8c88..5451b4f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -57,10 +57,9 @@ test_script:
 #  - cmd: choco install capnpc-csharp --source=".;https://chocolatey.org/api/v2" --force -y
   - cmd: choco install capnproto --source="https://chocolatey.org/api/v2" --force -y
   - cmd: cd %APPVEYOR_BUILD_FOLDER%\capnpc-csharp
-  - powershell: |
-      $jversion = nbgv get-version -f json | ConvertFrom-Json
-      $version = $($jversion.NuGetPackageVersion)
-      dotnet tool install --global --add-source ./nupkg capnpc-csharp --version $(version)
+  - cmd: echo dotnet tool install --global --add-source ./nupkg capnpc-csharp --version > install.bat
+  - cmd: nbgv get-version -v NuGetPackageVersion >> install.bat
+  - cmd: install.bat
   - cmd: cd %APPVEYOR_BUILD_FOLDER%\install-test
   - cmd: compile-test
   - cmd: cd %APPVEYOR_BUILD_FOLDER%