diff --git a/build/boards/cv181x/sg2002_milkv_duo256m_glibc_arm64_sd/dts_arm64/sg2002_milkv_duo256m_glibc_arm64_sd.dts b/build/boards/cv181x/sg2002_milkv_duo256m_glibc_arm64_sd/dts_arm64/sg2002_milkv_duo256m_glibc_arm64_sd.dts
index 412c54ec9..123d533a7 100644
--- a/build/boards/cv181x/sg2002_milkv_duo256m_glibc_arm64_sd/dts_arm64/sg2002_milkv_duo256m_glibc_arm64_sd.dts
+++ b/build/boards/cv181x/sg2002_milkv_duo256m_glibc_arm64_sd/dts_arm64/sg2002_milkv_duo256m_glibc_arm64_sd.dts
@@ -12,3 +12,7 @@
 	};
 };
 
+&dac {
+	mute-gpio-r = <&porte 1 GPIO_ACTIVE_LOW>;
+};
+
diff --git a/build/boards/cv181x/sg2002_milkv_duo256m_musl_riscv64_sd/dts_riscv/sg2002_milkv_duo256m_musl_riscv64_sd.dts b/build/boards/cv181x/sg2002_milkv_duo256m_musl_riscv64_sd/dts_riscv/sg2002_milkv_duo256m_musl_riscv64_sd.dts
index 8ee56e9e9..69b1625d3 100644
--- a/build/boards/cv181x/sg2002_milkv_duo256m_musl_riscv64_sd/dts_riscv/sg2002_milkv_duo256m_musl_riscv64_sd.dts
+++ b/build/boards/cv181x/sg2002_milkv_duo256m_musl_riscv64_sd/dts_riscv/sg2002_milkv_duo256m_musl_riscv64_sd.dts
@@ -7,3 +7,8 @@
 / {
 	model = "Milk-V Duo256M";
 };
+
+&dac {
+	mute-gpio-r = <&porte 1 GPIO_ACTIVE_LOW>;
+};
+