diff --git a/appveyor.yml b/appveyor.yml
index 0d8f165..f6258b9 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -61,7 +61,8 @@ before_deploy:
   - ps: |
         if ($env:Compiler -eq "mingw") {
             cmake --build . --target $env:INSTALL_TARGET
-            7z a "../criterion-$env:APPVEYOR_REPO_BRANCH-windows-$env:PLATFORM.tar.bz2" "criterion-$env:APPVEYOR_REPO_TAG_NAME"
+            7z a -ttar "criterion-$env:APPVEYOR_REPO_BRANCH-windows-$env:PLATFORM.tar" "criterion-$env:APPVEYOR_REPO_TAG_NAME"
+            7z a -tbzip2 "../criterion-$env:APPVEYOR_REPO_BRANCH-windows-$env:PLATFORM.tar.bz2" "criterion-$env:APPVEYOR_REPO_BRANCH-windows-$env:PLATFORM.tar"
             Push-AppveyorArtifact "../criterion-$env:APPVEYOR_REPO_BRANCH-windows-$env:PLATFORM.tar.bz2"
         }