diff --git a/esphome/components/opentherm/opentherm.h b/esphome/components/opentherm/opentherm.h
index 9532a77821..3be0191c63 100644
--- a/esphome/components/opentherm/opentherm.h
+++ b/esphome/components/opentherm/opentherm.h
@@ -370,7 +370,7 @@ class OpenTherm {
 
 #ifdef ESP8266
   // ESP8266 timer can accept callback with no parameters, so we have this hack to save a static instance of OpenTherm
-  static OpenTherm *instance;
+  static OpenTherm *instance;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
 #endif
 };