diff --git a/.github/workflows/snapshot.yml b/.github/workflows/snapshot.yml
index 3504ac24cf..475936f512 100644
--- a/.github/workflows/snapshot.yml
+++ b/.github/workflows/snapshot.yml
@@ -13,9 +13,9 @@ on:
         required: true
         default: "false"
       platforms:
-        description: 'List of platforms to build (comma seperated)'
+        description: 'List of platforms to build (comma seperated, e.g. "rpi3","rpi4")'
         required: true
-        default: ""
+        default: 'all'
         type: string
 
 # default read-only permission
@@ -48,7 +48,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: ${{ fromJSON(format('[{0}]', github.event.inputs.platforms || '"rpi0","rpi2","rpi3","rpi4","rpi5","tinkerboard","odroid-c2","odroid-c4","odroid-n2","intelnuc","ova","oci_amd64",oci_arm64","oci_arm"')) }}
+        platform: ${{ fromJSON(format('[{0}]', github.event.inputs.platforms != 'all' || '"rpi0","rpi2","rpi3","rpi4","rpi5","tinkerboard","odroid-c2","odroid-c4","odroid-n2","intelnuc","ova","oci_amd64",oci_arm64","oci_arm"')) }}
 
     steps:
       - name: Checkout Code