diff --git a/src/mainboard/starlabs/starfighter/variants/rpl/romstage.c b/src/mainboard/starlabs/starfighter/variants/rpl/romstage.c
index 785a8d135b..6ec63a16d7 100644
--- a/src/mainboard/starlabs/starfighter/variants/rpl/romstage.c
+++ b/src/mainboard/starlabs/starfighter/variants/rpl/romstage.c
@@ -134,6 +134,7 @@ void mainboard_memory_init_params(FSPM_UPD *mupd)
 	if (get_uint_option("thunderbolt", 1) == 0) {
 		mupd->FspmConfig.VtdItbtEnable = 0;
 		mupd->FspmConfig.VtdBaseAddress[3] = 0;
+		mupd->FspmConfig.VtdBaseAddress[4] = 0;
 		mupd->FspmConfig.TcssDma0En = 0;
 		mupd->FspmConfig.TcssItbtPcie0En = 0;
 		mupd->FspmConfig.TcssXhciEn = 0;