diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 970bafd88..bb9f0967d 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -1042,6 +1042,21 @@ void copyClosure(
     copyPaths(srcStore, dstStore, closure, repair, checkSigs, substitute);
 }
 
+void copyClosure(
+    Store & srcStore,
+    Store & dstStore,
+    const StorePathSet & storePaths,
+    RepairFlag repair,
+    CheckSigsFlag checkSigs,
+    SubstituteFlag substitute)
+{
+    if (&srcStore == &dstStore) return;
+
+    StorePathSet closure;
+    srcStore.computeFSClosure(storePaths, closure);
+    copyPaths(srcStore, dstStore, closure, repair, checkSigs, substitute);
+}
+
 std::optional<ValidPathInfo> decodeValidPathInfo(const Store & store, std::istream & str, std::optional<HashResult> hashGiven)
 {
     std::string path;
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 4fb6c40c7..81279c90b 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -794,6 +794,13 @@ void copyClosure(
     CheckSigsFlag checkSigs = CheckSigs,
     SubstituteFlag substitute = NoSubstitute);
 
+void copyClosure(
+    Store & srcStore, Store & dstStore,
+    const StorePathSet & paths,
+    RepairFlag repair = NoRepair,
+    CheckSigsFlag checkSigs = CheckSigs,
+    SubstituteFlag substitute = NoSubstitute);
+
 /* Remove the temporary roots file for this process.  Any temporary
    root becomes garbage after this point unless it has been registered
    as a (permanent) root. */