diff --git a/ArduPlane/ArduPlane.pde b/ArduPlane/ArduPlane.pde
index 493d266e34..f16b60ddc8 100644
--- a/ArduPlane/ArduPlane.pde
+++ b/ArduPlane/ArduPlane.pde
@@ -1,6 +1,6 @@
 /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 
-#define THISFIRMWARE "ArduPlane V2.78"
+#define THISFIRMWARE "ArduPlane V2.78b"
 /*
    Lead developer: Andrew Tridgell