diff --git a/sys/dev/ath/if_athvar.h b/sys/dev/ath/if_athvar.h
index e7b1648c5e41..ce2abc1f2404 100644
--- a/sys/dev/ath/if_athvar.h
+++ b/sys/dev/ath/if_athvar.h
@@ -314,8 +314,9 @@ typedef TAILQ_HEAD(ath_bufhead_s, ath_buf) ath_bufhead;
 #define	ATH_BUF_BUSY	0x00000002	/* (tx) desc owned by h/w */
 #define	ATH_BUF_FIFOEND	0x00000004
 #define	ATH_BUF_FIFOPTR	0x00000008
+#define	ATH_BUF_TOA_PROBE	0x00000010	/* ToD/ToA exchange probe */
 
-#define	ATH_BUF_FLAGS_CLONE	(ATH_BUF_MGMT)
+#define	ATH_BUF_FLAGS_CLONE	(ATH_BUF_MGMT | ATH_BUF_TOA_PROBE)
 
 /*
  * DMA state for tx/rx descriptors.