--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -215,20 +215,18 @@ pref("app.update.showInstalledUI", false
 //     to newer versions of installed addons that resolve them.
 // 1 = suppress prompting for incompatibilities only if there are VersionInfo
 //     updates available to installed addons that resolve them, not newer
 //     versions.
 pref("app.update.incompatible.mode", 0);
 
 // Whether or not to attempt using the service for updates.
 #ifdef MOZ_MAINTENANCE_SERVICE
-#ifndef HAVE_64BIT_BUILD
 pref("app.update.service.enabled", true);
 #endif
-#endif
 
 // Symmetric (can be overridden by individual extensions) update preferences.
 // e.g.
 //  extensions.{GUID}.update.enabled
 //  extensions.{GUID}.update.url
 //  .. etc ..
 //
 pref("extensions.update.enabled", true);

--- a/browser/confvars.sh
+++ b/browser/confvars.sh
@@ -5,18 +5,18 @@
 
 MOZ_APP_BASENAME=Firefox
 MOZ_APP_VENDOR=Mozilla
 MOZ_UPDATER=1
 MOZ_PHOENIX=1
 
 if test "$OS_ARCH" = "WINNT"; then
   MOZ_MAINTENANCE_SERVICE=1
+  MOZ_VERIFY_MAR_SIGNATURE=1
   if ! test "$HAVE_64BIT_BUILD"; then
-    MOZ_VERIFY_MAR_SIGNATURE=1
     if test "$MOZ_UPDATE_CHANNEL" = "nightly" -o \
             "$MOZ_UPDATE_CHANNEL" = "aurora" -o \
             "$MOZ_UPDATE_CHANNEL" = "beta" -o \
             "$MOZ_UPDATE_CHANNEL" = "release"; then
       if ! test "$MOZ_DEBUG"; then
         MOZ_STUB_INSTALLER=1
       fi
     fi