diff --git a/fsw/src/to_lab_app.c b/fsw/src/to_lab_app.c
index 17e2660..7a47b7e 100644
--- a/fsw/src/to_lab_app.c
+++ b/fsw/src/to_lab_app.c
@@ -204,7 +204,7 @@ int32 TO_LAB_init(void)
     {
         if (!CFE_SB_IsValidMsgId(TO_LAB_Subs->Subs[i].Stream))
         {
-            /* Only process until invalid MsgId (aka TO_LAB_UNUSED) is found*/
+            /* Only process until invalid MsgId is found*/
             break;
         }
         else if (CFE_SB_IsValidMsgId(TO_LAB_Subs->Subs[i].Stream))
diff --git a/fsw/src/to_lab_app.h b/fsw/src/to_lab_app.h
index b686c2e..4cfb2b1 100644
--- a/fsw/src/to_lab_app.h
+++ b/fsw/src/to_lab_app.h
@@ -36,7 +36,6 @@
 /*****************************************************************************/
 
 #define TO_LAB_TASK_MSEC 500 /* run at 2 Hz */
-#define TO_LAB_UNUSED    CFE_SB_MSGID_RESERVED
 
 /**
  * Depth of pipe for commands to the TO_LAB application itself