diff --git a/cores/nRF5/Print.h b/cores/nRF5/Print.h
index 9fc26742..ac142a0c 100644
--- a/cores/nRF5/Print.h
+++ b/cores/nRF5/Print.h
@@ -78,6 +78,8 @@ class Print
     size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
+    
+    virtual void flush() { /* Empty for backward compatibility */ }
 };
 
 #endif