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-rw-r--r--src/libstore/store-api.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index e6cbd53dc80a..76ed9942256b 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -547,6 +547,7 @@ void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
     if (!info->narHash && dontCheckSigs) {
         auto info2 = make_ref<ValidPathInfo>(*info);
         info2->narHash = hashString(htSHA256, *sink.s);
+        if (!info->narSize) info2->narSize = sink.s->size();
         info = info2;
     }