diff --git a/.github/workflows/manual_test.yml b/.github/workflows/manual_test.yml
index 7479e79..8815fc7 100644
--- a/.github/workflows/manual_test.yml
+++ b/.github/workflows/manual_test.yml
@@ -9,7 +9,7 @@ on:
         required: true
       machine_type:
         description: "GCE machine type: https://cloud.google.com/compute/docs/machine-types"
-        default: "n1-standard-4"
+        default: "n1-standard-1"
         required: true
       disk_size:
         description: VM disk size.
@@ -29,6 +29,10 @@ on:
         description: "Whether the GitHub actions have already been installed at `/actions-runner`."
         default: "false"
         required: true
+      vm_name_prefix:
+        description: Prefix of the name of created VM, final name is ${prefix}-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}
+        default: "gce-gh-runner"
+        required: true
 
 jobs:
   create-runner:
@@ -51,7 +55,7 @@ jobs:
           no_external_address: ${{ inputs.no_external_address }}
           actions_preinstalled: ${{ inputs.actions_preinstalled }}
           shutdown_timeout: ${{ inputs.shutdown_timeout }}
-
+          vm_name_prefix: ${{ inputs.vm_name_prefix }}
   test:
     needs: create-runner
     runs-on: ${{ needs.create-runner.outputs.label }}