diff --git a/appveyor.yml b/appveyor.yml
index 28c9e1b..90cb83c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -89,9 +89,8 @@ test_script:
       vstest.console /logger:Appveyor /inIsolation Capnp.Net.Runtime.Tests\bin\Release\net471\Capnp.Net.Runtime.Tests.Std20.dll
       vstest.console /logger:Appveyor /inIsolation Capnp.Net.Runtime.Tests.Core21\bin\Debug\netcoreapp2.1\Capnp.Net.Runtime.Tests.Core21.dll
       vstest.console /logger:Appveyor /inIsolation Capnp.Net.Runtime.Tests.Core21\bin\Release\netcoreapp2.1\Capnp.Net.Runtime.Tests.Core21.dll
-  - ps: |
-     .\scripts\measure-coverage.ps1
-     csmacnz.Coveralls --multiple -i "opencover=coverage\cov-Capnp.Net.Runtime-dnc21.xml;opencover=coverage\cov-Capnp.Net.Runtime-net471.xml;opencover=coverage\cov-CapnpC.CSharp.Generator.xml" --repoToken $env:COVERALLS_REPO_TOKEN --commitId $env:APPVEYOR_REPO_COMMIT --commitBranch $env:APPVEYOR_REPO_BRANCH --commitAuthor $env:APPVEYOR_REPO_COMMIT_AUTHOR --commitEmail $env:APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL --commitMessage $env:APPVEYOR_REPO_COMMIT_MESSAGE --jobId $env:APPVEYOR_JOB_ID
+      powershell -File .\scripts\measure-coverage.ps1
+      csmacnz.Coveralls --multiple -i "opencover=coverage\cov-Capnp.Net.Runtime-dnc21.xml;opencover=coverage\cov-Capnp.Net.Runtime-net471.xml;opencover=coverage\cov-CapnpC.CSharp.Generator.xml" --repoToken $env:COVERALLS_REPO_TOKEN --commitId $env:APPVEYOR_REPO_COMMIT --commitBranch $env:APPVEYOR_REPO_BRANCH --commitAuthor $env:APPVEYOR_REPO_COMMIT_AUTHOR --commitEmail $env:APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL --commitMessage $env:APPVEYOR_REPO_COMMIT_MESSAGE --jobId $env:APPVEYOR_JOB_ID
 on_finish :
   # any cleanup in here
 deploy: