diff --git a/firmware/lib/BUILD.gn b/firmware/lib/BUILD.gn
index a20b4b9..0949e0b 100644
--- a/firmware/lib/BUILD.gn
+++ b/firmware/lib/BUILD.gn
@@ -54,7 +54,7 @@
   ]
 
   cflags_c = [
-    # TODO(fxbug.dev/135166): Remove -Wno-unknown-warning-option after the next Clang roll.
+    # TODO(fxbug.dev/42084851): Remove -Wno-unknown-warning-option after the next Clang roll.
     "-Wno-unknown-warning-option",
     "-Wno-bitfield-conversion",
     "-Wno-implicit-int-conversion",