diff --git a/preprocessor b/preprocessor
index 59bda04d8..d4e20c7ec 160000
--- a/preprocessor
+++ b/preprocessor
@@ -1 +1 @@
-Subproject commit 59bda04d8b0a4e6444ef210e69c7f2ae90159ca7
+Subproject commit d4e20c7ec4c31befc489ffcca945bc7916a30b3c