diff --git a/deployment.sh b/deployment.sh
index fbf9f98..9ad9a58 100755
--- a/deployment.sh
+++ b/deployment.sh
@@ -1783,13 +1783,13 @@ vagrant_configuration() {
 
   # if ngcp-keyring isn't present (e.g. on plain Debian systems) then we have
   # to install our key for usage of our own Debian mirror
-  if apt-key list | grep -q 680FBA8A ; then
+  if grml-chroot $TARGET apt-key list | grep -q 680FBA8A ; then
     echo "Sipwise Debian mirror key is already present."
   else
     echo "Installing Sipwise Debian mirror key (680FBA8A)."
-    wget -O /etc/apt/680FBA8A.asc http://deb.sipwise.com/autobuild/680FBA8A.asc
-    apt-key add /etc/apt/680FBA8A.asc
-    apt-get update
+    grml-chroot $TARGET wget -O /etc/apt/680FBA8A.asc http://deb.sipwise.com/autobuild/680FBA8A.asc
+    grml-chroot $TARGET apt-key add /etc/apt/680FBA8A.asc
+    grml-chroot $TARGET apt-get update
   fi
 
   # required for fake_uname and VBoxLinuxAdditions.run