diff --git a/emulator/btdev.c b/emulator/btdev.c
index 925eaf7..f3de1a5 100644
--- a/emulator/btdev.c
+++ b/emulator/btdev.c
@@ -1475,7 +1475,10 @@ static void default_cmd(struct btdev *btdev, uint16_t opcode,
 	case BT_HCI_CMD_LE_SET_SCAN_PARAMETERS:
 		if (btdev->type == BTDEV_TYPE_BREDR)
 			goto unsupported;
-		status = BT_HCI_ERR_SUCCESS;
+		if (btdev->le_scan_enable)
+			status = BT_HCI_ERR_COMMAND_DISALLOWED;
+		else
+			status = BT_HCI_ERR_SUCCESS;
 		cmd_complete(btdev, opcode, &status, sizeof(status));
 		break;