diff --git a/mgmt/rlm.c b/mgmt/rlm.c
index ea8159a..87e656e 100644
--- a/mgmt/rlm.c
+++ b/mgmt/rlm.c
@@ -987,7 +987,12 @@
 	prBssInfo = prAdapter->aprBssInfo[prMsduInfo->ucBssIndex];
 	if (!prBssInfo)
 		return;
-
+	/* [TGac 5.2.46 STBC Receive Test with UCC 9.2.x]
+	 * Operating Notification IE of Nss=2 will make Ralink testbed send data frames without STBC
+	 * Enable the Operating Notification IE only for DBDC enable case.
+	 */
+	if (!prAdapter->rWifiVar.fgDbDcModeEn)
+		return;
 	prStaRec = cnmGetStaRecByIndex(prAdapter, prMsduInfo->ucStaRecIndex);
 
 	if ((prAdapter->rWifiVar.ucAvailablePhyTypeSet & PHY_TYPE_SET_802_11AC) &&