diff --git a/msg/MoveItErrorCodes.msg b/msg/MoveItErrorCodes.msg
index 2aff013..523a193 100644
--- a/msg/MoveItErrorCodes.msg
+++ b/msg/MoveItErrorCodes.msg
@@ -2,6 +2,7 @@ int32 val
 
 # overall behavior
 int32 SUCCESS=1
+int32 UNDEFINED=0
 int32 FAILURE=99999
 
 int32 PLANNING_FAILED=-1