diff --git a/mozilla/modules/libpref/src/init/all.js b/mozilla/modules/libpref/src/init/all.js
index 91bca138b59..cc1d07347c2 100644
--- a/mozilla/modules/libpref/src/init/all.js
+++ b/mozilla/modules/libpref/src/init/all.js
@@ -47,7 +47,7 @@ pref("keyword.URL", "http://keyword.netscape.com/keyword/");
 pref("keyword.enabled", false);
 pref("general.useragent.locale", "chrome://navigator/locale/navigator.properties");
 pref("general.useragent.contentlocale", "chrome://navigator-region/locale/region.properties");
-pref("general.useragent.misc", "rv:1.5a");
+pref("general.useragent.misc", "rv:1.5b");
 
 pref("general.startup.browser",             true);
 pref("general.startup.mail",                false);