diff --git a/src/mainboard/lenovo/t420/devicetree.cb b/src/mainboard/lenovo/t420/devicetree.cb
index 65c567c..9f42cbb 100644
--- a/src/mainboard/lenovo/t420/devicetree.cb
+++ b/src/mainboard/lenovo/t420/devicetree.cb
@@ -54,8 +54,8 @@
 			register "gpi1_routing" = "2"
 			register "gpi13_routing" = "2"
 
-			# Enable SATA ports 0 (HDD bay) & 1 (ODD bay) & 2 (mSATA) & 4 (dock) & 5 (eSATA)
-			register "sata_port_map" = "0x37"
+			# Enable SATA ports 0 (HDD bay) & 1 (ODD bay) & 2 (mSATA) & 3 (eSATA) & 4 (dock)
+			register "sata_port_map" = "0x1f"
 			# Set max SATA speed to 6.0 Gb/s
 			register "sata_interface_speed_support" = "0x3"