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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 9c755965e4..9ab3f36329 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -822,6 +822,7 @@ void copyPaths(ref<Store> from, ref<Store> to, const Paths & storePaths, bool su
         PathSet(storePaths.begin(), storePaths.end()),
 
         [&](const Path & storePath) {
+            if (to->isValidPath(storePath)) return PathSet();
             return from->queryPathInfo(storePath)->references;
         },