diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 23b0a3e32f2ee7d56713442cabe531aec9494b17..028ca096d18db047dcf54a6e03268c21bf905751 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -521,4 +521,5 @@
 &mmc1 {
 	status = "okay";
 	vmmc-supply = <&vmmc_reg>;
+	bus-width = <4>;
 };
diff --git a/arch/arm/boot/dts/am335x-evmsk.dts b/arch/arm/boot/dts/am335x-evmsk.dts
index bc93895a6eca4232fb7f5047c5eb4dc1d0645733..563a2b136e0eb494d3195a9e40cfe82b4891f29f 100644
--- a/arch/arm/boot/dts/am335x-evmsk.dts
+++ b/arch/arm/boot/dts/am335x-evmsk.dts
@@ -423,4 +423,5 @@
 &mmc1 {
 	status = "okay";
 	vmmc-supply = <&vmmc_reg>;
+	bus-width = <4>;
 };