diff --git a/Tools/Replay/Replay.pde b/Tools/Replay/Replay.pde
index 118e51bdf1..203874d529 100644
--- a/Tools/Replay/Replay.pde
+++ b/Tools/Replay/Replay.pde
@@ -50,6 +50,7 @@
 #include <AP_Terrain.h>
 #include <AP_OpticalFlow.h>
 #include <Parameters.h>
+#include <AP_SerialManager.h>
 #include <stdio.h>
 #include <getopt.h>
 #include <errno.h>