diff --git a/salt/common/tools/sbin/soup b/salt/common/tools/sbin/soup
index 8bdb67e8c..dc10b3f18 100755
--- a/salt/common/tools/sbin/soup
+++ b/salt/common/tools/sbin/soup
@@ -719,8 +719,7 @@ up_to_2.3.100() {
   fi
 
   echo "Adding receiver to assigned_hostgroups.local.map.yaml"
-  grep -qxF "  receiver:" /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml || echo "  receiver:" >> /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml
-
+  grep -qxF "  receiver:" /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml || sed -i -e '$a  receiver:' /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml
 }
 
 verify_upgradespace() {