diff --git a/dev/api/pci.rst b/dev/api/pci.rst
index 527f7d5..fe3bcc7 100644
--- a/dev/api/pci.rst
+++ b/dev/api/pci.rst
@@ -792,7 +792,7 @@ The main difference between this register and BARs is that the ROM can be enable
             rom_init(&dev->rom, "roms/scsi/foo/foo4321.bin", 0, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
 
             /* ...but don't map it right now. */
-            mem_mapping_set_addr(&dev->rom.mapping, 0, 0);
+            mem_mapping_disable(&dev->rom.mapping);
 
             return dev;
         }