diff --git a/src/midi_Message.h b/src/midi_Message.h
index 1c3a3cd..a292bc9 100644
--- a/src/midi_Message.h
+++ b/src/midi_Message.h
@@ -43,6 +43,13 @@ struct Message
     */
     static const unsigned sSysExMaxSize = SysExMaxSize;
 
+    /*! Static method accessor for SysEx max size, used for unit tests.
+    */
+    static inline unsigned getSysExMaxSize()
+    {
+        return SysExMaxSize;
+    }
+
     /*! The MIDI channel on which the message was recieved.
      \n Value goes from 1 to 16.
      */