diff --git a/sh/sh.sh b/sh/sh.sh
index 6fab8a6..a1dc2d1 100644
--- a/sh/sh.sh
+++ b/sh/sh.sh
@@ -1,11 +1,12 @@
 PS1="\$(shell_prompt \${?})"
 PS2="\
 ├ "
-SH="$(cat /proc/$$/comm)"
+
+SH_SHELL="$(cat /proc/$$/comm)"
 
 shell_color() {
 	local code="${1}"
-	case "${SH}" in
+	case "${SH_SHELL}" in
 	"bash")
 		printf "\x01\e[0"
 		if [ -n "${code}" ]; then
@@ -32,7 +33,7 @@ SH_MAGENTA="$(shell_color 35)"
 SH_RED="$(shell_color 32)"
 
 shell_configure() {
-	case "${SH}" in
+	case "${SH_SHELL}" in
 	"bash")
 		# completion
 		local root="/usr/share/bash-completion"
@@ -140,7 +141,7 @@ x() {
 		"${@}"
 }
 
-[ "${SH}" = "bash" ] || return
+[ "${SH_SHELL}" = "bash" ] || return
 
 # shellcheck disable=SC3033
 ..() {