diff --git a/esphome/components/socket/lwip_getaddrinfo_impl.cpp b/esphome/components/socket/lwip_getaddrinfo_impl.cpp
index d4fb1fdc7d..d37087ad11 100644
--- a/esphome/components/socket/lwip_getaddrinfo_impl.cpp
+++ b/esphome/components/socket/lwip_getaddrinfo_impl.cpp
@@ -178,7 +178,7 @@ std::unique_ptr<GetaddrinfoFuture> getaddrinfo_async(const char *node, const cha
 
 #ifdef USE_ESP8266
 void freeaddrinfo(struct addrinfo *ai) {
-  while (ai != NULL) {
+  while (ai != nullptr) {
     struct addrinfo *next = ai->ai_next;
     delete ai;
     ai = next;