diff --git a/sh/debian.sh b/sh/debian.sh
index 39639b9..b544f08 100644
--- a/sh/debian.sh
+++ b/sh/debian.sh
@@ -1,4 +1,4 @@
-DEBIAN_CODENAME="$(
+SH_DEBIAN_CODENAME="$(
 	grep "VERSION_CODENAME" "/etc/os-release" |
 		cut --delimiter "=" --fields "2"
 )"
@@ -23,11 +23,11 @@ Dpkg::Progress True;
 }
 
 sh_apt_install_backports() {
-	sh_apt_install_target "${DEBIAN_CODENAME}-backports" "${@}"
+	sh_apt_install_target "${SH_DEBIAN_CODENAME}-backports" "${@}"
 }
 
 sh_apt_install_release() {
-	sh_apt_install_target "${DEBIAN_CODENAME}" "${@}"
+	sh_apt_install_target "${SH_DEBIAN_CODENAME}" "${@}"
 }
 
 sh_apt_install_target() {
@@ -49,13 +49,13 @@ sh_apt_install_target() {
 sh_apt_sources_write() {
 	printf "%s" "\
 deb https://deb.debian.org/debian \
-${DEBIAN_CODENAME} main non-free-firmware contrib non-free
+${SH_DEBIAN_CODENAME} main non-free-firmware contrib non-free
 deb https://deb.debian.org/debian \
-${DEBIAN_CODENAME}-backports main non-free-firmware contrib non-free
+${SH_DEBIAN_CODENAME}-backports main non-free-firmware contrib non-free
 deb https://deb.debian.org/debian \
-${DEBIAN_CODENAME}-updates main non-free-firmware contrib non-free
+${SH_DEBIAN_CODENAME}-updates main non-free-firmware contrib non-free
 deb https://deb.debian.org/debian-security \
-${DEBIAN_CODENAME}-security main non-free-firmware contrib non-free
+${SH_DEBIAN_CODENAME}-security main non-free-firmware contrib non-free
 " >"/etc/apt/sources.list"
 }