diff --git a/salt/common/tools/sbin/so-common b/salt/common/tools/sbin/so-common
index 705ce841a..676b908ce 100755
--- a/salt/common/tools/sbin/so-common
+++ b/salt/common/tools/sbin/so-common
@@ -412,7 +412,7 @@ valid_proxy() {
 	mapfile -t url_arr <<< "$(echo "$proxy" | tr ":" "\n")"
 
 	local valid_url=true
-	if ! valid_ip4 "${url_arr[0]}" && ! valid_fqdn "${url_arr[0]}"; then
+	if ! valid_ip4 "${url_arr[0]}" && ! valid_fqdn "${url_arr[0]}" && ! valid_hostname "${url_arr[0]}"; then
 		valid_url=false
 	fi