diff --git a/drivers/net/wireless/rt2x00/rt2x00ht.c b/drivers/net/wireless/rt2x00/rt2x00ht.c
index c004cd3..ad3c7ff 100644
--- a/drivers/net/wireless/rt2x00/rt2x00ht.c
+++ b/drivers/net/wireless/rt2x00/rt2x00ht.c
@@ -54,6 +54,16 @@
 	 */
 	if (txrate->flags & IEEE80211_TX_RC_MCS) {
 		txdesc->mcs = txrate->idx;
+
+		/*
+		 * MIMO PS should be set to 1 for STA's using dynamic SM PS
+		 * when using more then one tx stream (>MCS7).
+		 */
+		if (tx_info->control.sta && txdesc->mcs > 7 &&
+		    (tx_info->control.sta->ht_cap.cap &
+		     (WLAN_HT_CAP_SM_PS_DYNAMIC <<
+		      IEEE80211_HT_CAP_SM_PS_SHIFT)))
+			__set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
 	} else {
 		txdesc->mcs = rt2x00_get_rate_mcs(hwrate->mcs);
 		if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)