diff --git a/ci-automation/vms.sh b/ci-automation/vms.sh
index 7d4d9d31980..9583fb0c11a 100644
--- a/ci-automation/vms.sh
+++ b/ci-automation/vms.sh
@@ -136,6 +136,8 @@ function _vm_build_impl() {
             COMPRESSION_FORMAT="gz,bz2,none"
         elif [[ "${format}" =~ ^(qemu|qemu_uefi)$ ]];then
             COMPRESSION_FORMAT="bz2,none"
+        elif [[ "${format}" =~ ^(hyperv|hyperv_vhdx)$ ]];then
+            COMPRESSION_FORMAT="zip"
         fi
         ./run_sdk_container -n "${vms_container}" -C "${packages_image}" \
             -v "${vernum}" \