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-rw-r--r--src/libexpr/primops/fetchGit.cc2
-rw-r--r--src/libexpr/primops/fetchMercurial.cc2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/libexpr/primops/fetchGit.cc b/src/libexpr/primops/fetchGit.cc
index fd536c6a5e46..8bb74dad639e 100644
--- a/src/libexpr/primops/fetchGit.cc
+++ b/src/libexpr/primops/fetchGit.cc
@@ -114,7 +114,7 @@ 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 <= now - settings.tarballTtl;
+            st.st_mtime + settings.tarballTtl <= now;
     }
     if (doFetch)
     {
diff --git a/src/libexpr/primops/fetchMercurial.cc b/src/libexpr/primops/fetchMercurial.cc
index 5517d83df824..a75c5fc2ddff 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. */