diff --git a/southbridge/amd/amd8111/amd8111_smbus.h b/southbridge/amd/amd8111/amd8111_smbus.h
index 34710a8245..1a9187156f 100644
--- a/southbridge/amd/amd8111/amd8111_smbus.h
+++ b/southbridge/amd/amd8111/amd8111_smbus.h
@@ -1,4 +1,5 @@
 #include <device/smbus_def.h>
+#include <io.h>
 
 #define SMBGSTATUS 0xe0
 #define SMBGCTL    0xe2
diff --git a/southbridge/amd/amd8111/stage1_smbus.c b/southbridge/amd/amd8111/stage1_smbus.c
index 79c7f34f2e..0e1e9f92cc 100644
--- a/southbridge/amd/amd8111/stage1_smbus.c
+++ b/southbridge/amd/amd8111/stage1_smbus.c
@@ -37,12 +37,11 @@
 
 void enable_smbus(void)
 {
-	u32 bdf;
+	u32 dev;
 	u8 enable;
 
-	/* this 746b is the ACPI device. This is from original code. It's weird however. */
-	pci_locate_device_on_bus(0, PCI_VENDOR_ID_AMD, 0x746b, &dev);
-	if (dev == PCI_DEV_INVALID) {
+	/* Yes, the ACPI device controls the SMBUS.  */
+	if (!pci_conf1_find_on_bus(0, PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_ACPI, &dev)){
 		die("SMBUS controller not found\r\n");
 	}