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-rw-r--r--src/libexpr/primops/fetchMercurial.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops/fetchMercurial.cc b/src/libexpr/primops/fetchMercurial.cc
index 5517d83df..a75c5fc2d 100644
--- a/src/libexpr/primops/fetchMercurial.cc
+++ b/src/libexpr/primops/fetchMercurial.cc
@@ -80,7 +80,7 @@ HgInfo exportMercurial(ref<Store> store, const std::string & uri,
time_t now = time(0);
struct stat st;
if (stat(stampFile.c_str(), &st) != 0 ||
- st.st_mtime <= now - settings.tarballTtl)
+ st.st_mtime + settings.tarballTtl <= now)
{
/* Except that if this is a commit hash that we already have,
we don't have to pull again. */