diff --git a/cores/arduino/Server.h b/cores/arduino/Server.h
index 77c415c..69e3e39 100644
--- a/cores/arduino/Server.h
+++ b/cores/arduino/Server.h
@@ -20,6 +20,8 @@
 #ifndef server_h
 #define server_h
 
+#include "Print.h"
+
 class Server : public Print {
 public:
   virtual void begin() =0;