diff --git a/Bag-of-Tricks.md b/Bag-of-Tricks.md
index 4d53ff1..ebb9313 100644
--- a/Bag-of-Tricks.md
+++ b/Bag-of-Tricks.md
@@ -104,7 +104,7 @@ class BufferedPrint : public Print {
   }
 
   void flush() {
-    buffer[_size] = '\0';
+    _buffer[_size] = '\0';
     _destination.print(_buffer);
     _size = 0;
   }