diff --git a/libraries/AsyncUDP/src/AsyncUDP.h b/libraries/AsyncUDP/src/AsyncUDP.h
index 3f3724a8af8..95e0b8c1358 100644
--- a/libraries/AsyncUDP/src/AsyncUDP.h
+++ b/libraries/AsyncUDP/src/AsyncUDP.h
@@ -4,6 +4,7 @@
 #include "IPAddress.h"
 #include "IPv6Address.h"
 #include "Print.h"
+#include "Stream.h"
 #include <functional>
 extern "C" {
 #include "lwip/ip_addr.h"