diff --git a/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl b/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
index d4debd7a1f3..27aabcde5f9 100644
--- a/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
+++ b/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
@@ -103,6 +103,8 @@ $RunMozillaTests          = 1;  # Allow turning off of all tests if needed.
 
 $moz_cvsroot   = ":ext:cltbld\@cvs.mozilla.org:/cvsroot";
 
+$MofoRoot   = ":ext:cltbld\@cvs.mozilla.org:/mofo";
+
 #- Set these proper values for your tinderbox server
 #$Tinderbox_server = 'tinderbox-daemon@tinderbox.mozilla.org';
 
diff --git a/tools/tinderbox-configs/thunderbird/macosx/tinder-config.pl b/tools/tinderbox-configs/thunderbird/macosx/tinder-config.pl
index 565d6811247..8d68f207243 100644
--- a/tools/tinderbox-configs/thunderbird/macosx/tinder-config.pl
+++ b/tools/tinderbox-configs/thunderbird/macosx/tinder-config.pl
@@ -139,6 +139,8 @@ $AliveTest                = 1;
 #$moz_cvsroot   = $ENV{CVSROOT};
 $moz_cvsroot   = ":ext:cltbld\@cvs.mozilla.org:/cvsroot";
 
+$MofoRoot   = ":ext:cltbld\@cvs.mozilla.org:/mofo";
+
 #- Set these proper values for your tinderbox server
 #$Tinderbox_server = 'tinderbox-daemon@tinderbox.mozilla.org';
 
diff --git a/tools/tinderbox-configs/thunderbird/win32/tinder-config.pl b/tools/tinderbox-configs/thunderbird/win32/tinder-config.pl
index 7dbe1ab4973..cc31d97ed71 100644
--- a/tools/tinderbox-configs/thunderbird/win32/tinder-config.pl
+++ b/tools/tinderbox-configs/thunderbird/win32/tinder-config.pl
@@ -110,6 +110,8 @@ $use_blat       = 1;
 
 $moz_cvsroot   = $ENV{CVSROOT};
 
+$MofoRoot   = ":ext:cltbld\@cvs.mozilla.org:/mofo";
+
 #- Set these proper values for your tinderbox server
 #$Tinderbox_server = 'tinderbox-daemon@tinderbox.mozilla.org';