diff --git a/arch/arm/boot/dts/rk3288-tb.dts b/arch/arm/boot/dts/rk3288-tb.dts
index 1bc241fd4029..f018695d4b43 100755
--- a/arch/arm/boot/dts/rk3288-tb.dts
+++ b/arch/arm/boot/dts/rk3288-tb.dts
@@ -808,7 +808,7 @@ regulator-state-mem {
 
 		ldo1_reg: regulator@4 {
 			regulator-name= "vccio_sd";
-			regulator-min-microvolt = <3300000>;
+			regulator-min-microvolt = <1800000>;
 			regulator-max-microvolt = <3300000>;
 			
 		};