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-rw-r--r--third_party/nix/src/libexpr/primops/fetchGit.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/primops/fetchGit.cc b/third_party/nix/src/libexpr/primops/fetchGit.cc
index d0e0d389ccca..2b2ca476cbbb 100644
--- a/third_party/nix/src/libexpr/primops/fetchGit.cc
+++ b/third_party/nix/src/libexpr/primops/fetchGit.cc
@@ -129,7 +129,8 @@ GitInfo exportGit(ref<Store> store, const std::string& uri,
        git fetch to update the local ref to the remote ref. */
     struct stat st;
     doFetch = stat(localRefFile.c_str(), &st) != 0 ||
-              (uint64_t)st.st_mtime + settings.tarballTtl <= (uint64_t)now;
+              static_cast<uint64_t>(st.st_mtime) + settings.tarballTtl <=
+                  static_cast<uint64_t>(now);
   }
   if (doFetch) {
     DLOG(INFO) << "fetching Git repository '" << uri << "'";