diff --git a/setup/so-functions b/setup/so-functions
index 86ef60203..e1467191e 100755
--- a/setup/so-functions
+++ b/setup/so-functions
@@ -2685,8 +2685,8 @@ set_updates() {
 	if [ "$MANAGERUPDATES" = '1' ]; then
 		if [ "$OS" = 'centos' ]; then
 			if [[ ! $is_airgap ]] && ! ( grep -q "$MSRV" /etc/yum.conf); then
-				if grep -q "proxy="; then
-					sed -i "s/proxy=.*/proxy=http:\/\/$MSRV:3142/"
+				if grep -q "proxy=" /etc/yum.conf; then
+					sed -i "s/proxy=.*/proxy=http:\/\/$MSRV:3142/" /etc/yum.conf
 				else
 					echo "proxy=http://$MSRV:3142" >> /etc/yum.conf
 				fi