diff --git a/src/soc/mediatek/mt8192/devapc.c b/src/soc/mediatek/mt8192/devapc.c
index 327896b10a..e854727355 100644
--- a/src/soc/mediatek/mt8192/devapc.c
+++ b/src/soc/mediatek/mt8192/devapc.c
@@ -71,9 +71,10 @@ static void fmem_master_init(uintptr_t base)
 static void scp_master_init(uintptr_t base)
 {
 	write32(getreg(base, SCP_DOM), MAS_DOMAIN_3);
+	write32(getreg(base, ADSP_DOM), MAS_DOMAIN_4);
 
-	/* Let SCP_DOM register be read-only for security */
-	write32(getreg(base, ONETIME_LOCK), 0x1);
+	/* Let SCP_DOM and ADSP_DOM registers be read-only for security */
+	write32(getreg(base, ONETIME_LOCK), 0x5);
 }
 
 struct devapc_init {
diff --git a/src/soc/mediatek/mt8192/include/soc/devapc.h b/src/soc/mediatek/mt8192/include/soc/devapc.h
index fd332dbd15..e79acfa2b9 100644
--- a/src/soc/mediatek/mt8192/include/soc/devapc.h
+++ b/src/soc/mediatek/mt8192/include/soc/devapc.h
@@ -23,6 +23,7 @@ enum devapc_ao_offset {
 
 enum scp_offset {
 	SCP_DOM = 0xA5080,
+	ADSP_DOM = 0xA5088,
 	ONETIME_LOCK = 0xA5104,
 };