diff --git a/src/apple2.mem.c b/src/apple2.mem.c
index e5d990f..ab3b6de 100644
--- a/src/apple2.mem.c
+++ b/src/apple2.mem.c
@@ -58,9 +58,8 @@ apple2_mem_write_bank(vm_segment *segment,
     mach = (apple2 *)_mach;
 
     switch (mach->memory_mode) {
+        // Whoops -- we can't write any data into ROM.
         case MEMORY_BANK_ROM:
-            vm_segment_set(mach->rom,
-                           address - APPLE2_BANK_OFFSET, value);
             return;
 
         case MEMORY_BANK_RAM2: