diff --git a/collects/setup/option-sig.ss b/collects/setup/option-sig.ss
index 3d4b1c9d67..c9b2d0a9f7 100644
--- a/collects/setup/option-sig.ss
+++ b/collects/setup/option-sig.ss
@@ -14,6 +14,7 @@
      make-launchers
      call-install
      pause-on-errors
+     force-unpacks
      specific-collections
      archives
      current-target-directory-getter)))