diff --git a/sys/dev/ath/ath_hal/ah.c b/sys/dev/ath/ath_hal/ah.c
index 574e46cd71b2..c7840c664975 100644
--- a/sys/dev/ath/ath_hal/ah.c
+++ b/sys/dev/ath/ath_hal/ah.c
@@ -748,6 +748,9 @@ ath_hal_getcapability(struct ath_hal *ah, HAL_CAPABILITY_TYPE type,
 	case HAL_CAP_RXTSTAMP_PREC:	/* rx desc tstamp precision (bits) */
 		*result = pCap->halTstampPrecision;
 		return HAL_OK;
+	case HAL_CAP_ANT_DIV_COMB:	/* AR9285/AR9485 LNA diversity */
+		return pCap->halAntDivCombSupport ? HAL_OK  : HAL_ENOTSUPP;
+
 	case HAL_CAP_ENHANCED_DFS_SUPPORT:
 		return pCap->halEnhancedDfsSupport ? HAL_OK : HAL_ENOTSUPP;
 
diff --git a/sys/dev/ath/ath_hal/ah.h b/sys/dev/ath/ath_hal/ah.h
index 1d29e4164092..842b6582fd66 100644
--- a/sys/dev/ath/ath_hal/ah.h
+++ b/sys/dev/ath/ath_hal/ah.h
@@ -169,6 +169,7 @@ typedef enum {
 
 	HAL_CAP_RXTSTAMP_PREC	= 100,	/* rx desc tstamp precision (bits) */
 
+	HAL_CAP_ANT_DIV_COMB	= 105,	/* Enable antenna diversity/combining */
 	HAL_CAP_PHYRESTART_CLR_WAR	= 106,	/* in some cases, clear phy restart to fix bb hang */
 	HAL_CAP_ENTERPRISE_MODE	= 107,	/* Enterprise mode features */
 	HAL_CAP_LDPCWAR		= 108,