diff --git a/tools/tinderbox-configs/thunderbird/linux/CLOBBER b/tools/tinderbox-configs/thunderbird/linux/CLOBBER
index 6ecea517fd2..f2794f41798 100644
--- a/tools/tinderbox-configs/thunderbird/linux/CLOBBER
+++ b/tools/tinderbox-configs/thunderbird/linux/CLOBBER
@@ -1 +1 @@
-Clobbering to force rebuild with bustage fix for bug 413413
+Clobbering to force nightly due to nightly bustage from bug 428672.
diff --git a/tools/tinderbox-configs/thunderbird/macosx/CLOBBER b/tools/tinderbox-configs/thunderbird/macosx/CLOBBER
index 6ecea517fd2..f2794f41798 100644
--- a/tools/tinderbox-configs/thunderbird/macosx/CLOBBER
+++ b/tools/tinderbox-configs/thunderbird/macosx/CLOBBER
@@ -1 +1 @@
-Clobbering to force rebuild with bustage fix for bug 413413
+Clobbering to force nightly due to nightly bustage from bug 428672.
diff --git a/tools/tinderbox-configs/thunderbird/win32/CLOBBER b/tools/tinderbox-configs/thunderbird/win32/CLOBBER
index 6ecea517fd2..f2794f41798 100644
--- a/tools/tinderbox-configs/thunderbird/win32/CLOBBER
+++ b/tools/tinderbox-configs/thunderbird/win32/CLOBBER
@@ -1 +1 @@
-Clobbering to force rebuild with bustage fix for bug 413413
+Clobbering to force nightly due to nightly bustage from bug 428672.