diff --git a/src/superio/smsc/mec1308/acpi/superio.asl b/src/superio/smsc/mec1308/acpi/superio.asl
index 96f2ef838c..2b32e33c79 100644
--- a/src/superio/smsc/mec1308/acpi/superio.asl
+++ b/src/superio/smsc/mec1308/acpi/superio.asl
@@ -249,12 +249,12 @@ Device (SIO) {
 
 		Name (_CRS, ResourceTemplate()
 		{
-			IO (Decode16, SIO_SMBX_IO0, SIO_SMBX_IO0, 0x34, 0x34)
+			FixedIO (SIO_SMBX_IO0, 0x34)
 		})
 
 		Name (_PRS, ResourceTemplate()
 		{
-			IO (Decode16, SIO_SMBX_IO0, SIO_SMBX_IO0, 0x34, 0x34)
+			FixedIO (SIO_SMBX_IO0, 0x34)
 		})
 	}
 #endif