2 files changed, 2 insertions, 1 deletions
diff --git a/cores/arduino/Print.h b/cores/arduino/Print.h
index 4d8a2f5..2b5aafd 100644
--- a/cores/arduino/Print.h
+++ b/cores/arduino/Print.h
@@ -87,6 +87,8 @@ class Print
     size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
+
+    virtual void flush() { /* Empty implementation for backward compatibility */ }
 };
 
 #endif
diff --git a/cores/arduino/Stream.h b/cores/arduino/Stream.h
index e4fd433..78a1c07 100644
--- a/cores/arduino/Stream.h
+++ b/cores/arduino/Stream.h
@@ -59,7 +59,6 @@ class Stream : public Print
     virtual int available() = 0;
     virtual int read() = 0;
     virtual int peek() = 0;
-    virtual void flush() = 0;
 
     Stream() {_timeout=1000;}