diff --git a/mozilla/tools/tinderbox-configs/thunderbird/linux/CLOBBER b/mozilla/tools/tinderbox-configs/thunderbird/linux/CLOBBER
new file mode 100644
index 00000000000..1ceb51d3bcc
--- /dev/null
+++ b/mozilla/tools/tinderbox-configs/thunderbird/linux/CLOBBER
@@ -0,0 +1 @@
+clobbering to switch to an objdir in bug 377100.
diff --git a/mozilla/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl b/mozilla/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
index 09b3719f97f..f78f5113982 100644
--- a/mozilla/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
+++ b/mozilla/tools/tinderbox-configs/thunderbird/linux/tinder-config.pl
@@ -112,7 +112,7 @@ $MofoRoot   = ":ext:cltbld\@cvs.mozilla.org:/mofo";
 #$moz_client_mk = 'client.mk';
 
 #- Set if you want to build in a separate object tree
-#$ObjDir = 'obj-tb-trunk';
+$ObjDir = 'obj-tb-trunk';
 
 # Extra build name, if needed.
 $BuildNameExtra = 'release';