From 2f18ae00c5add1832bfce396264b943afe29914d Mon Sep 17 00:00:00 2001
From: Samuel Sieb <samuel-github@sieb.net>
Date: Thu, 10 Nov 2022 10:40:53 -0800
Subject: [PATCH] fix to_lower filter (#4015)

---
 esphome/components/text_sensor/filter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/text_sensor/filter.cpp b/esphome/components/text_sensor/filter.cpp
index ba77913d1b..80edae2b6c 100644
--- a/esphome/components/text_sensor/filter.cpp
+++ b/esphome/components/text_sensor/filter.cpp
@@ -51,7 +51,7 @@ optional<std::string> ToUpperFilter::new_value(std::string value) {
 // ToLowerFilter
 optional<std::string> ToLowerFilter::new_value(std::string value) {
   for (char &c : value)
-    c = ::toupper(c);
+    c = ::tolower(c);
   return value;
 }