diff --git a/clean_files.txt b/clean_files.txt
index c9d6cb3b..5cececcf 100644
--- a/clean_files.txt
+++ b/clean_files.txt
@@ -44,6 +44,7 @@ themes/brainy
 themes/brunton
 themes/command_duration.theme.bash
 themes/modern
+themes/purity
 
 # plugins
 #
diff --git a/themes/purity/purity.theme.bash b/themes/purity/purity.theme.bash
index ba1b1b63..8fc03bf3 100644
--- a/themes/purity/purity.theme.bash
+++ b/themes/purity/purity.theme.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 
 SCM_THEME_PROMPT_DIRTY=" ${bold_red}⊘${normal}"
 SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓${normal}"
@@ -26,8 +26,9 @@ venv_prompt() {
 }
 
 function prompt_command() {
-    local ret_status="$( [ $? -eq 0 ] && echo -e "$STATUS_THEME_PROMPT_OK" || echo -e "$STATUS_THEME_PROMPT_BAD")"
-    PS1="\n${PURITY_THEME_PROMPT_COLOR}\w $(scm_prompt_info)\n${ret_status}$(venv_prompt)"
+	retval=$?
+	local ret_status="$([ $retval -eq 0 ] && echo -e "$STATUS_THEME_PROMPT_OK" || echo -e "$STATUS_THEME_PROMPT_BAD")"
+	PS1="\n${PURITY_THEME_PROMPT_COLOR}\w $(scm_prompt_info)\n${ret_status}$(venv_prompt)"
 }
 
 safe_append_prompt_command prompt_command