diff --git a/library/Process-darwin.cpp b/library/Process-darwin.cpp
index d6988d5d6..69defbf92 100644
--- a/library/Process-darwin.cpp
+++ b/library/Process-darwin.cpp
@@ -41,6 +41,7 @@ using namespace std;
 
 #include <md5wrapper.h>
 #include "MemAccess.h"
+#include "Memory.h"
 #include "VersionInfoFactory.h"
 #include "VersionInfo.h"
 #include "Error.h"
@@ -241,7 +242,7 @@ void Process::getMemRanges( vector<t_memrange> & ranges )
 
 uintptr_t Process::getBase()
 {
-    return 0x1000;
+    return DEFAULT_BASE_ADDR;  // Memory.h
 }
 
 int Process::adjustOffset(int offset, bool /*to_file*/)
diff --git a/library/Process-linux.cpp b/library/Process-linux.cpp
index 14c70a802..7a72171ca 100644
--- a/library/Process-linux.cpp
+++ b/library/Process-linux.cpp
@@ -39,6 +39,7 @@ using namespace std;
 
 #include <md5wrapper.h>
 #include "MemAccess.h"
+#include "Memory.h"
 #include "VersionInfoFactory.h"
 #include "VersionInfo.h"
 #include "Error.h"
@@ -167,7 +168,7 @@ void Process::getMemRanges( vector<t_memrange> & ranges )
 
 uintptr_t Process::getBase()
 {
-    return 0x8048000;
+    return DEFAULT_BASE_ADDR;  // Memory.h
 }
 
 int Process::adjustOffset(int offset, bool /*to_file*/)
diff --git a/library/Process-windows.cpp b/library/Process-windows.cpp
index 5474d7cfb..b9e58462b 100644
--- a/library/Process-windows.cpp
+++ b/library/Process-windows.cpp
@@ -43,6 +43,7 @@ using namespace std;
 #include "VersionInfoFactory.h"
 #include "Error.h"
 #include "MemAccess.h"
+#include "Memory.h"
 using namespace DFHack;
 namespace DFHack
 {
@@ -306,7 +307,7 @@ uintptr_t Process::getBase()
 {
     if(d)
         return (uintptr_t) d->base;
-    return 0x400000;
+    return DEFAULT_BASE_ADDR; // Memory.h
 }
 
 int Process::adjustOffset(int offset, bool to_file)
diff --git a/library/VersionInfoFactory.cpp b/library/VersionInfoFactory.cpp
index 02dac568c..672f5a9c8 100644
--- a/library/VersionInfoFactory.cpp
+++ b/library/VersionInfoFactory.cpp
@@ -34,6 +34,7 @@ using namespace std;
 #include "VersionInfoFactory.h"
 #include "VersionInfo.h"
 #include "Error.h"
+#include "Memory.h"
 using namespace DFHack;
 
 #include <tinyxml.h>
@@ -98,25 +99,20 @@ void VersionInfoFactory::ParseVersion (TiXmlElement* entry, VersionInfo* mem)
     if(os == "windows")
     {
         mem->setOS(OS_WINDOWS);
-        // set default image base. this is fixed for base relocation later
-        mem->setBase(0x400000);
     }
     else if(os == "linux")
     {
         mem->setOS(OS_LINUX);
-        // this is wrong... I'm not going to do base image relocation on linux though.
-        mem->setBase(0x8048000);
     }
     else if(os == "darwin")
     {
         mem->setOS(OS_APPLE);
-        // this is wrong... I'm not going to do base image relocation on linux though.
-        mem->setBase(0x1000);
     }
     else
     {
         return; // ignore it if it's invalid
     }
+    mem->setBase(DEFAULT_BASE_ADDR);  // Memory.h
 
     // process additional entries
     //cout << "Entry " << cstr_version << " " <<  cstr_os << endl;
diff --git a/library/include/Memory.h b/library/include/Memory.h
new file mode 100644
index 000000000..1016f2966
--- /dev/null
+++ b/library/include/Memory.h
@@ -0,0 +1,22 @@
+// Default base address
+#if defined(_WIN32)
+    #ifdef DFHACK64
+        #define DEFAULT_BASE_ADDR 0x140000000
+    #else
+        #define DEFAULT_BASE_ADDR 0x400000
+    #endif
+#elif defined(_DARWIN)
+    #ifdef DFHACK64
+        #define DEFAULT_BASE_ADDR 0x1000
+    #else
+        #define DEFAULT_BASE_ADDR 0x1000
+    #endif
+#elif defined(_LINUX)
+    #ifdef DFHACK64
+        #define DEFAULT_BASE_ADDR 0x8048000
+    #else
+        #define DEFAULT_BASE_ADDR 0x8048000
+    #endif
+#else
+    #error Unknown OS
+#endif