--- a/im/app/nsMain.cpp
+++ b/im/app/nsMain.cpp
@@ -18,21 +18,16 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <time.h>
 
 #include "nsCOMPtr.h"
 #include "nsIFile.h"
 
 #ifdef XP_WIN
-#ifdef MOZ_ASAN
-// ASAN requires firefox.exe to be built with -MD, and it's OK if we don't
-// support Windows XP SP2 in ASAN builds.
-#define XRE_DONT_SUPPORT_XPSP2
-#endif
 #define XRE_WANT_ENVIRON
 #define strcasecmp _stricmp
 #ifdef MOZ_SANDBOX
 #include "mozilla/sandboxing/SandboxInitialization.h"
 #endif
 #endif
 #include "BinaryPath.h"
 

--- a/mail/app/nsMailApp.cpp
+++ b/mail/app/nsMailApp.cpp
@@ -18,21 +18,16 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <time.h>
 
 #include "nsCOMPtr.h"
 #include "nsIFile.h"
 
 #ifdef XP_WIN
-#ifdef MOZ_ASAN
-// ASAN requires firefox.exe to be built with -MD, and it's OK if we don't
-// support Windows XP SP2 in ASAN builds.
-#define XRE_DONT_SUPPORT_XPSP2
-#endif
 #define XRE_WANT_ENVIRON
 #define strcasecmp _stricmp
 #ifdef MOZ_SANDBOX
 #include "mozilla/sandboxing/SandboxInitialization.h"
 #endif
 #endif
 #include "BinaryPath.h"
 

--- a/suite/app/nsSuiteApp.cpp
+++ b/suite/app/nsSuiteApp.cpp
@@ -18,21 +18,16 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <time.h>
 
 #include "nsCOMPtr.h"
 #include "nsIFile.h"
 
 #ifdef XP_WIN
-#ifdef MOZ_ASAN
-// ASAN requires seamonkey.exe to be built with -MD, and it's OK if we don't
-// support Windows XP SP2 in ASAN builds.
-#define XRE_DONT_SUPPORT_XPSP2
-#endif
 #define XRE_WANT_ENVIRON
 #define strcasecmp _stricmp
 #ifdef MOZ_SANDBOX
 #include "mozilla/sandboxing/SandboxInitialization.h"
 #endif
 #endif
 #include "BinaryPath.h"