From f9fd5fa0ad8982be2541ad08ff8fd6e70776615b Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Tue, 10 Mar 2026 22:31:43 -1000
Subject: [PATCH] Include lwip_fast_select.h for esphome_lwip_set_nodelay
 declaration

The forward declaration of struct lwip_sock alone is not enough -
the fast path in setsockopt() needs the function declaration too.
---
 esphome/components/socket/bsd_sockets_impl.h  | 2 +-
 esphome/components/socket/lwip_sockets_impl.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/esphome/components/socket/bsd_sockets_impl.h b/esphome/components/socket/bsd_sockets_impl.h
index 6e2af08ab40..339a699bc97 100644
--- a/esphome/components/socket/bsd_sockets_impl.h
+++ b/esphome/components/socket/bsd_sockets_impl.h
@@ -14,7 +14,7 @@
 #endif
 
 #ifdef USE_LWIP_FAST_SELECT
-struct lwip_sock;
+#include "esphome/core/lwip_fast_select.h"
 #endif
 
 namespace esphome::socket {
diff --git a/esphome/components/socket/lwip_sockets_impl.h b/esphome/components/socket/lwip_sockets_impl.h
index 6ab4ecf2ee5..bfc4da9926a 100644
--- a/esphome/components/socket/lwip_sockets_impl.h
+++ b/esphome/components/socket/lwip_sockets_impl.h
@@ -10,7 +10,7 @@
 #include "headers.h"
 
 #ifdef USE_LWIP_FAST_SELECT
-struct lwip_sock;
+#include "esphome/core/lwip_fast_select.h"
 #endif
 
 namespace esphome::socket {