diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index cc58ecb..53447f6 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -2705,12 +2705,23 @@
 		return;
 
 	if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
-		if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
+		if (*total_flags & FIF_BCN_PRBRESP_PROMISC) {
+			/*
+			 * Disable the BSS filter.
+			 */
 			mwl8k_cmd_set_pre_scan(hw);
-		else {
+		} else {
 			u8 *bssid;
 
-			bssid = "\x00\x00\x00\x00\x00\x00";
+			/*
+			 * Enable the BSS filter.
+			 *
+			 * If there is an active STA interface, use that
+			 * interface's BSSID, otherwise use a dummy one
+			 * (where the OUI part needs to be nonzero for
+			 * the BSSID to be accepted by POST_SCAN).
+			 */
+			bssid = "\x01\x00\x00\x00\x00\x00";
 			if (priv->vif != NULL)
 				bssid = MWL8K_VIF(priv->vif)->bssid;