diff --git a/build/fbcode_builder/getdeps/copytree.py b/build/fbcode_builder/getdeps/copytree.py
index 9e85d765d..27cff565d 100644
--- a/build/fbcode_builder/getdeps/copytree.py
+++ b/build/fbcode_builder/getdeps/copytree.py
@@ -54,10 +54,6 @@ def prefetch_dir_if_eden(dirpath):
     so we help accelerate things by performing a prefetch on the
     source directory """
     global PREFETCHED_DIRS
-    if is_windows():
-        # prefetch takes longer than not prefetching our opensource
-        # projects until we cut over to the new globfiles implementation
-        return
     if dirpath in PREFETCHED_DIRS:
         return
     root = find_eden_root(dirpath)