diff --git a/tools/build_uec.sh b/tools/build_uec.sh
index 4ffd02a..174ac47 100755
--- a/tools/build_uec.sh
+++ b/tools/build_uec.sh
@@ -196,7 +196,7 @@ mkdir -p /opt/stack
 useradd stack -s /bin/bash -d /opt/stack -G libvirtd || true
 echo stack:pass | chpasswd
 mkdir -p /opt/stack/.ssh
-echo `cat ~/.ssh/id_rsa.pub` > /opt/stack/.ssh/authorized_keys
+echo "`cat ~/.ssh/id_rsa.pub`" > /opt/stack/.ssh/authorized_keys
 chown -R stack /opt/stack
 chmod 700 /opt/stack/.ssh
 chmod 600 /opt/stack/.ssh/authorized_keys