diff --git a/RingStream.cpp b/RingStream.cpp
index 1fa9ec6..70b66c2 100644
--- a/RingStream.cpp
+++ b/RingStream.cpp
@@ -18,6 +18,7 @@
  */
 
 #include "RingStream.h"
+#include "defines.h"
 #include "DIAG.h"
 
 RingStream::RingStream( const uint16_t len)