diff --git a/scripts/vm/systemvm/injectkeys.sh b/scripts/vm/systemvm/injectkeys.sh
index f69e33168d7..6f224cdddcf 100755
--- a/scripts/vm/systemvm/injectkeys.sh
+++ b/scripts/vm/systemvm/injectkeys.sh
@@ -85,14 +85,19 @@ systemvmpath=$3
 
 command -v mkisofs > /dev/null   || (echo "$(basename $0): mkisofs not found, please install or ensure PATH is accurate" ; exit 4)
 
-# if running into Docker as unprivileges, skip ssh verification as iso cannot be mounted.
-if [ -e /dev/loop0 ]; then
+# if running into Docker as unprivileges, skip ssh verification as iso cannot be mounted due to missing loop device.
+if [ -f /.dockerinit ]; then
+  if [ -e /dev/loop0 ]; then
+    # it's a docker instance with privileges.
+    inject_into_iso systemvm.iso $newpubkey
+    [ $? -ne 0 ] && exit 5
+    copy_priv_key $newprivkey
+  else
+    # this mean it's a docker instance, ssh key cannot be verify.
+    echo "We run inside Docker, skipping ssh key insertion in systemvm.iso"
+  fi
+else
   inject_into_iso systemvm.iso $newpubkey
   [ $? -ne 0 ] && exit 5
   copy_priv_key $newprivkey
-else
-  # this mean it's a docker instance, ssh key cannot be verify.
-  echo "No loop device found, skipping ssh key insertion in systemvm.iso"
 fi
-
-exit $?