diff --git a/build/fbcode_builder/getdeps/fetcher.py b/build/fbcode_builder/getdeps/fetcher.py
index 0528d10aa..e7173fc3a 100644
--- a/build/fbcode_builder/getdeps/fetcher.py
+++ b/build/fbcode_builder/getdeps/fetcher.py
@@ -148,7 +148,7 @@ class GitFetcher(Fetcher):
             os.makedirs(repos_dir)
         self.repo_dir = os.path.join(repos_dir, directory)
 
-        if not rev:
+        if not rev and build_options.project_hashes:
             hash_file = os.path.join(
                 build_options.project_hashes,
                 re.sub("\\.git$", "-rev.txt", url.path[1:]),