diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index 3f4d598d48..3bba879823 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -57,7 +57,7 @@ namespace esphome::web_server {
 static const char *const TAG = "web_server";
 
 // View a state LogString as a ProgmemStr so ArduinoJson serializes it PROGMEM-aware on ESP8266.
-static ProgmemStr json_state_str(const LogString *s) { return reinterpret_cast<ProgmemStr>(s); }
+[[maybe_unused]] static ProgmemStr json_state_str(const LogString *s) { return reinterpret_cast<ProgmemStr>(s); }
 
 // Parse URL and return match info
 // URL formats (disambiguated by HTTP method for 3-segment case):