diff --git a/sys/dev/ath/ath_hal/ah_internal.h b/sys/dev/ath/ath_hal/ah_internal.h
index f3fd9e834c53..2caf5cc581ac 100644
--- a/sys/dev/ath/ath_hal/ah_internal.h
+++ b/sys/dev/ath/ath_hal/ah_internal.h
@@ -195,7 +195,8 @@ typedef struct {
 			halForcePpmSupport		: 1,
 			halEnhancedPmSupport		: 1,
 			halMbssidAggrSupport		: 1,
-			halBssidMatchSupport		: 1;
+			halBssidMatchSupport		: 1,
+			hal4kbSplitTransSupport		: 1;
 	uint32_t	halWirelessModes;
 	uint16_t	halTotalQueues;
 	uint16_t	halKeyCacheSize;
diff --git a/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c b/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
index c76e18892e62..e1a506719127 100644
--- a/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
+++ b/sys/dev/ath/ath_hal/ar5210/ar5210_attach.c
@@ -377,6 +377,8 @@ ar5210FillCapabilityInfo(struct ath_hal *ah)
 			| HAL_INT_FATAL
 			;
 
+	pCap->hal4kbSplitTransSupport = AH_TRUE;
+
 	ahpriv->ah_rxornIsFatal = AH_TRUE;
 	return AH_TRUE;
 }
diff --git a/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c b/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
index fe87fce5abc1..bace64821f25 100644
--- a/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
+++ b/sys/dev/ath/ath_hal/ar5211/ar5211_attach.c
@@ -509,6 +509,8 @@ ar5211FillCapabilityInfo(struct ath_hal *ah)
 			| HAL_INT_TIM
 			;
 
+	pCap->hal4kbSplitTransSupport = AH_TRUE;
+
 	/* XXX might be ok w/ some chip revs */
 	ahpriv->ah_rxornIsFatal = AH_TRUE;
 	return AH_TRUE;
diff --git a/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c b/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
index 9a2bc70a87d3..3aabdcc98571 100644
--- a/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
+++ b/sys/dev/ath/ath_hal/ar5212/ar5212_attach.c
@@ -860,6 +860,8 @@ ar5212FillCapabilityInfo(struct ath_hal *ah)
 	if (AH_PRIVATE(ah)->ah_macVersion < AR_SREV_VERSION_GRIFFIN)
 		pCap->halIntrMask &= ~HAL_INT_TBTT;
 
+	pCap->hal4kbSplitTransSupport = AH_TRUE;
+
 	return AH_TRUE;
 #undef IS_COBRA
 #undef IS_GRIFFIN_LITE
diff --git a/sys/dev/ath/ath_hal/ar9002/ar9280_attach.c b/sys/dev/ath/ath_hal/ar9002/ar9280_attach.c
index 698f9a93d338..80281d8c6295 100644
--- a/sys/dev/ath/ath_hal/ar9002/ar9280_attach.c
+++ b/sys/dev/ath/ath_hal/ar9002/ar9280_attach.c
@@ -698,9 +698,7 @@ ar9280FillCapabilityInfo(struct ath_hal *ah)
 	pCap->halBtCoexSupport = AH_TRUE;
 #endif
 	pCap->halAutoSleepSupport = AH_FALSE;	/* XXX? */
-#if 0
 	pCap->hal4kbSplitTransSupport = AH_FALSE;
-#endif
 	pCap->halRxStbcSupport = 1;
 	pCap->halTxStbcSupport = 1;
 
diff --git a/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c b/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
index d62d0e6195f4..ee65841d23f1 100644
--- a/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
+++ b/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
@@ -384,9 +384,7 @@ ar9285FillCapabilityInfo(struct ath_hal *ah)
 	pCap->halBtCoexSupport = AH_TRUE;
 #endif
 	pCap->halAutoSleepSupport = AH_FALSE;	/* XXX? */
-#if 0
 	pCap->hal4kbSplitTransSupport = AH_FALSE;
-#endif
 	pCap->halRxStbcSupport = 1;
 	pCap->halTxStbcSupport = 1;