diff --git a/collects/compiler/sig.ss b/collects/compiler/sig.ss
index 6256a711e7..b351979c1c 100644
--- a/collects/compiler/sig.ss
+++ b/collects/compiler/sig.ss
@@ -84,6 +84,9 @@
      compile-collection-extension
      compile-collection-zos
 
+     compile-directory-extension
+     compile-directory-zos
+ 
      current-compiler-dynamic-require-wrapper
      compile-notify-handler))