diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index 038b747a2a..afdcdef950 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -288,6 +288,7 @@ void WebServer::setup() {
     logger::global_logger->add_on_log_callback(
         // logs are not deferred, the memory overhead would be too large
         [this](int level, const char *tag, const char *message, size_t message_len) {
+          (void)message_len;
           this->events_.try_send_nodefer(message, "log", millis());
         });
   }