diff --git a/tools/firrtl b/tools/firrtl
index 228c9a4b..99ae1d66 160000
--- a/tools/firrtl
+++ b/tools/firrtl
@@ -1 +1 @@
-Subproject commit 228c9a4b7432ac52178d63b8f27fe064aec71e9c
+Subproject commit 99ae1d6649f1731c5dec2098b10733735232b72c