diff --git a/sys/dev/ath/if_ath_debug.h b/sys/dev/ath/if_ath_debug.h
index 2e6ebf5f4c04..875a6c8310e6 100644
--- a/sys/dev/ath/if_ath_debug.h
+++ b/sys/dev/ath/if_ath_debug.h
@@ -65,6 +65,7 @@ enum {
 	ATH_DEBUG_FATAL		= 0x080000000ULL,	/* fatal errors */
 	ATH_DEBUG_SW_TX_BAR	= 0x100000000ULL,	/* BAR TX */
 	ATH_DEBUG_EDMA_RX	= 0x200000000ULL,	/* RX EDMA state */
+	ATH_DEBUG_SW_TX_FILT	= 0x400000000ULL,	/* SW TX FF */
 
 	ATH_DEBUG_ANY		= 0xffffffffffffffffULL
 };