diff --git a/Makeconf b/Makeconf
index 08a2572..96de62c 100644
--- a/Makeconf
+++ b/Makeconf
@@ -1,6 +1,7 @@
 modules := memory/mem_device \
            memory/bus \
            memory/ram \
+           memory/bootrom_overlay \
            cpu/cpu \
            cpu/decoder
 
diff --git a/memory/bootrom_overlay.cpp b/memory/bootrom_overlay.cpp
index bbcfdb1..4cf74e9 100644
--- a/memory/bootrom_overlay.cpp
+++ b/memory/bootrom_overlay.cpp
@@ -1,7 +1,8 @@
 #include "memory/bootrom_overlay.h"
 
 BootRom::BootRom(Mem_device* lowmem, Mem_device* highmem, Mem_device* backend)
-  : lowmem(lowmem), highmem(highmem), backend(backend), enabled(true)
+  : lowmem(lowmem), highmem(highmem), backend(backend), enabled(true),
+    lowrange(0x0000, 0x00FF), highrange(0x0200, 0x08FF)
 {}
 
 void BootRom::enable()
diff --git a/memory/bootrom_overlay.h b/memory/bootrom_overlay.h
index c5439dd..f1e5460 100644
--- a/memory/bootrom_overlay.h
+++ b/memory/bootrom_overlay.h
@@ -1,7 +1,7 @@
 #pragma once
 #include <memory/mem_device.h>
 
-class BootRom : Mem_device
+class BootRom : public Mem_device
 {
 private:
   Mem_device* lowmem;
@@ -9,8 +9,8 @@ private:
 
   Mem_device* backend;
 
-  const Range lowrange(0x0000, 0x00FF);
-  const Range highrange(0x0200, 0x08FF);
+  Range lowrange;
+  Range highrange;
 
   bool enabled;
 public:
@@ -25,4 +25,4 @@ public:
   virtual void write16(u16 addr, u16 data);
   virtual u16 read16(u16 addr);
 
-}
+};