diff --git a/src/arch/i386/core/pci_autoboot.c b/src/arch/i386/core/pci_autoboot.c
index bbb40277..5e6197e2 100644
--- a/src/arch/i386/core/pci_autoboot.c
+++ b/src/arch/i386/core/pci_autoboot.c
@@ -34,8 +34,10 @@ uint16_t __bss16 ( autoboot_busdevfn );
  */
 static void pci_autoboot_init ( void ) {
 
-	autoboot_device.bus_type = BUS_TYPE_PCI;
-	autoboot_device.location = autoboot_busdevfn;
+	if ( autoboot_busdevfn ) {
+		autoboot_device.bus_type = BUS_TYPE_PCI;
+		autoboot_device.location = autoboot_busdevfn;
+	}
 }
 
 /** PCI autoboot device initialisation function */