diff --git a/CLOBBER b/CLOBBER
index 5f015d93349d..6881acdc0fcf 100644
--- a/CLOBBER
+++ b/CLOBBER
@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-No bug - unknown something produced intermittent OS X build failures in libstagefright and jemalloc and malloc
+Bug 1210154 - Update the clang toolchain
diff --git a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
index 1c8d936fc826..d6a88f3d5cde 100644
--- a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
@@ -3,10 +3,10 @@
 "clang_version": "r247539"
 }, 
 {
-"size": 106877168,
-"digest": "1c50c6348eaf429ed59bb603cff63bcc1f870f59216dd3c234db5b1156cfd351d5ee7b820ec31be4d2661eb4213b2e0030e2ba2782b42905d1ec19c7f8bd322a",
+"size": 121389802,
+"digest": "2be6b42cfa1e92de4b49a57123f54043fec2d3cf8385276516dc6aaed99c88768ac4aebd7ce2e007ab074163523da29223436a4d1aef82f0f750f08f1b14cd71",
 "algorithm": "sha512",
-"filename": "clang.tar.xz",
+"filename": "clang.tar.bz2",
 "unpack": true
 },
 {