diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
index 87b455f..d7c3e22 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
@@ -84,7 +84,7 @@
 	register "SataPortsDevSlp[0]" = "0"
 	register "SataPortsDevSlp[1]" = "0"
 
-	register "ScsEmmcHs400Enabled" = "1"
+	register "ScsEmmcHs400Enabled" = "0"
 	register "ScsEmmcDdr50Enabled" = "1"
 	register "SdCardPowerEnableActiveHigh" = "1"
 
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 438419a..ffcf1da 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -69,7 +69,7 @@
 	register "PcieRpLtrDisable[6]" = "true"
 
 	# Storage (SDCARD/EMMC) related UPDs
-	register "ScsEmmcHs400Enabled" = "1"
+	register "ScsEmmcHs400Enabled" = "0"
 	register "ScsEmmcDdr50Enabled" = "1"
 	register "SdCardPowerEnableActiveHigh" = "1"