diff --git a/.local/bin/homeinit b/.local/bin/homeinit
index 5a71dbbe..9e65726d 100755
--- a/.local/bin/homeinit
+++ b/.local/bin/homeinit
@@ -10,6 +10,7 @@ ROOT=$HTTPS_ROOT
 PROFILE=/tmp/homeinit-$USER/homeinit
 USER_NAME=Ambrevar
 SUBSTITUTE_URLS=https://ci.guix.gnu.org
+EXTRA_SUBSTITUTE_URLS=
 ## Hardcoded in .mbsyncrc:
 MAIL_CACHE="$HOME/.cache/mail"
 
@@ -27,7 +28,7 @@ Initialize user profile: install packages, set up folders, etc.
 Options:
 
   -g DEVICE: Device where to sync ~/.gnupg from, e.g. '/dev/sda1'.
-  -u:        Skip large updates (packages, emails, etc.)
+  -u:        Skip large updates (large packages, email cache, etc.)
   -s URLS:   Extra substitute URLs for Guix (space separated).
              Example: 'http://192.168.1.2:8080'.
 
@@ -64,7 +65,7 @@ while getopts ":hg:s:u" opt; do
 	g)
 		OPT_DEVICE="$OPTARG" ;;
 	s)
-		SUBSTITUTE_URLS="$OPTARG $SUBSTITUTE_URLS" ;;
+		EXTRA_SUBSTITUTE_URLS="$OPTARG $EXTRA_SUBSTITUTE_URLS" ;;
 	u)
 		OPT_UPDATE=false ;;
 	\?)
@@ -115,6 +116,22 @@ inpath() {
 	return 0
 }
 
+## Pass substitute URLs dynamically to avoid overriding the daemon settings.
+run_guix() {
+	if [ -z "$EXTRA_SUBSTITUTE_URLS" ]; then
+		guix "$@"
+	else
+		guix --substitute-urls="$EXTRA_SUBSTITUTE_URLS $SUBSTITUTE_URLS" "$@"
+	fi
+}
+run_current_guix() {
+	if [ -z "$EXTRA_SUBSTITUTE_URLS" ]; then
+		~/.config/guix/current/bin/guix "$@"
+	else
+		~/.config/guix/current/bin/guix --substitute-urls="$EXTRA_SUBSTITUTE_URLS $SUBSTITUTE_URLS" "$@"
+	fi
+}
+
 ################################################################################
 #
 
@@ -125,7 +142,7 @@ if inpath guix; then
 	## OpenSSH is not an input of Git, upstream does not want to increase the
 	## closure size that much.
 	mkdir -p "$(dirname "$PROFILE")"
-	guix package --profile="$PROFILE" --install openssh gnupg git stow password-store pinentry-tty pinentry-gtk2 cryptsetup recutils --substitute-urls="$SUBSTITUTE_URLS"
+	run_guix package --profile="$PROFILE" --install openssh gnupg git stow password-store pinentry-tty pinentry-gtk2 cryptsetup recutils
 	source "$PROFILE"/etc/profile
 fi
 
@@ -224,14 +241,14 @@ guix_install_profile() {
 	if [ -f "$manifest" ]; then
 		if [ "$1" = "default" ]; then
 			info "Installing default profile..."
-			~/.config/guix/current/bin/guix package --manifest="$manifest" --keep-failed --substitute-urls="$SUBSTITUTE_URLS"
+			run_current_guix package --manifest="$manifest" --keep-failed
 			. ~/.guix-profile/etc/profile
 		else
 			profile=$HOME/.guix-extra-profiles/$1/$1
 			if [ ! -d "$HOME/.guix-extra-profiles/$1/$1" ]; then
 				info "Installing profile '$profile'..."
 				mkdir -p $(dirname "$profile")
-				~/.config/guix/current/bin/guix package --manifest="$manifest" --keep-failed --profile="$profile" --substitute-urls="$SUBSTITUTE_URLS"
+				run_current_guix package --manifest="$manifest" --keep-failed --profile="$profile"
 				if [ -f "$profile"/etc/profile ]; then
 					. "$profile"/etc/profile
 				fi
@@ -248,7 +265,7 @@ section "System packages"
 if inpath guix; then
 	if [ ! -e ~/.cache/guix ]; then
 		message "First 'guix pull'"
-		guix pull --substitute-urls="$SUBSTITUTE_URLS"
+		run_guix pull
 		hash guix
 	fi