diff --git a/stack.sh b/stack.sh
index ea5ddb28cd..331743f0a6 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1268,7 +1268,7 @@ if is_service_enabled nova && is_baremetal; then
     sudo dnsmasq --conf-file= --port=0 --enable-tftp --tftp-root=/tftpboot \
         --dhcp-boot=pxelinux.0 --bind-interfaces --pid-file=/var/run/dnsmasq.pid \
         --interface=$BM_DNSMASQ_IFACE --dhcp-range=$BM_DNSMASQ_RANGE \
-        ${$BM_DNSMASQ_DNS:+--dhcp-option=option:dns-server,$BM_DNSMASQ_DNS}
+        ${BM_DNSMASQ_DNS:+--dhcp-option=option:dns-server,$BM_DNSMASQ_DNS}
     # ensure callback daemon is running
     sudo pkill nova-baremetal-deploy-helper || true
     screen_it baremetal "nova-baremetal-deploy-helper"