diff --git a/mozilla/config/autoconf.mk.in b/mozilla/config/autoconf.mk.in
index 2939f6b108b..3eb902c10e1 100644
--- a/mozilla/config/autoconf.mk.in
+++ b/mozilla/config/autoconf.mk.in
@@ -45,6 +45,7 @@ BUILD_MODULES	= @BUILD_MODULES@
 MOZILLA_VERSION = @MOZILLA_VERSION@
 FIREFOX_VERSION	= @FIREFOX_VERSION@
 THUNDERBIRD_VERSION	= @THUNDERBIRD_VERSION@
+SUNBIRD_VERSION = @SUNBIRD_VERSION@
 SEAMONKEY_VERSION	= @SEAMONKEY_VERSION@
 
 MOZ_BUILD_APP = @MOZ_BUILD_APP@
diff --git a/mozilla/configure.in b/mozilla/configure.in
index 294db8a8c33..a8578da5d2f 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -1367,6 +1367,7 @@ MOZILLA_VERSION=`$PERL $srcdir/config/milestone.pl -topsrcdir $srcdir`
 dnl Get version of various core apps from the version files.
 FIREFOX_VERSION=`cat $topsrcdir/browser/config/version.txt`
 THUNDERBIRD_VERSION=`cat $topsrcdir/mail/config/version.txt`
+SUNBIRD_VERSION=`cat $topsrcdir/calendar/sunbird/config/version.txt`
 SEAMONKEY_VERSION=`cat $topsrcdir/xpfe/bootstrap/version.txt`
 
 AC_DEFINE_UNQUOTED(MOZILLA_VERSION,"$MOZILLA_VERSION")
@@ -4610,7 +4611,7 @@ calendar)
   MOZ_UPDATER=1
   MOZ_SUNBIRD=1
   MOZ_CALENDAR=1
-  MOZ_APP_VERSION=`cat $topsrcdir/calendar/sunbird/config/version.txt`
+  MOZ_APP_VERSION=$SUNBIRD_VERSION
   MOZ_EXTENSIONS_DEFAULT=
   MOZ_UNIVERSALCHARDET=
   AC_DEFINE(MOZ_SUNBIRD)
@@ -7415,6 +7416,7 @@ AC_SUBST(MOZ_APP_DISPLAYNAME)
 AC_SUBST(MOZ_APP_VERSION)
 AC_SUBST(FIREFOX_VERSION)
 AC_SUBST(THUNDERBIRD_VERSION)
+AC_SUBST(SUNBIRD_VERSION)
 AC_SUBST(SEAMONKEY_VERSION)
 
 AC_SUBST(MOZ_PKG_SPECIAL)