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-rw-r--r--src/libexpr/primops/fetchGit.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index cf7ccca418ed..3dcf3e9ff862 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -116,7 +116,7 @@ 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 ||
-            st.st_mtime + settings.tarballTtl <= now;
+            (uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now;
     }
     if (doFetch)
     {