diff --git a/src/mainboard/siemens/mc_apl1/devicetree.cb b/src/mainboard/siemens/mc_apl1/devicetree.cb
index ab143f738e..7f4983e512 100644
--- a/src/mainboard/siemens/mc_apl1/devicetree.cb
+++ b/src/mainboard/siemens/mc_apl1/devicetree.cb
@@ -84,10 +84,10 @@ chip soc/intel/apollolake
 		device pci 17.1 off end	# - I2C 5
 		device pci 17.2 off end	# - I2C 6
 		device pci 17.3 on  end	# - I2C 7
-		device pci 18.0 on  end	# - UART 0
-		device pci 18.1 on  end	# - UART 1
-		device pci 18.2 on  end	# - UART 2
-		device pci 18.3 on  end	# - UART 3
+		device pci 18.0 off end	# - UART 0
+		device pci 18.1 off end	# - UART 1
+		device pci 18.2 off end	# - UART 2
+		device pci 18.3 off end	# - UART 3
 		device pci 19.0 off end	# - SPI 0
 		device pci 19.1 off end	# - SPI 1
 		device pci 19.2 off end	# - SPI 2