diff --git a/esphome/components/web_server_idf/web_server_idf.cpp b/esphome/components/web_server_idf/web_server_idf.cpp
index 2e0797b169..fb0c17c854 100644
--- a/esphome/components/web_server_idf/web_server_idf.cpp
+++ b/esphome/components/web_server_idf/web_server_idf.cpp
@@ -121,11 +121,10 @@ void AsyncWebServer::begin() {
   if (this->server_) {
     this->end();
   }
-  // Default httpd stack is 4096. Increase to accommodate SerializationBuffer's
+  // Default httpd stack is defined by ESP-IDF. Increase to accommodate SerializationBuffer's
   // 640-byte stack buffer used by web_server JSON request handlers.
-  constexpr size_t httpd_stack_size = 4096 + 256;
   httpd_config_t config = HTTPD_DEFAULT_CONFIG();
-  config.stack_size = httpd_stack_size;
+  config.stack_size = config.stack_size + 256;
   config.server_port = this->port_;
   config.uri_match_fn = [](const char * /*unused*/, const char * /*unused*/, size_t /*unused*/) { return true; };
   // Always enable LRU purging to handle socket exhaustion gracefully.