diff --git a/src/libexpr/primops/fetchClosure.cc b/src/libexpr/primops/fetchClosure.cc
index 0f7eafefe9e6..84bce6116ea3 100644
--- a/src/libexpr/primops/fetchClosure.cc
+++ b/src/libexpr/primops/fetchClosure.cc
@@ -24,6 +24,8 @@ static void runFetchClosureWithRewrite(
     const std::optional<StorePath> & toPathMaybe,
     Value & v)
 {
+    if (toPathMaybe)
+        state.store->addTempRoot(*toPathMaybe);
 
     // establish toPath or throw
 
@@ -75,6 +77,7 @@ static void runFetchClosureWithRewrite(
 static void runFetchClosureWithContentAddressedPath(
     EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, Value & v)
 {
+    state.store->addTempRoot(fromPath);
 
     if (!state.store->isValidPath(fromPath))
         copyClosure(fromStore, *state.store, RealisedPath::Set{fromPath});
@@ -104,6 +107,7 @@ static void runFetchClosureWithContentAddressedPath(
 static void runFetchClosureWithInputAddressedPath(
     EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, Value & v)
 {
+    state.store->addTempRoot(fromPath);
 
     if (!state.store->isValidPath(fromPath))
         copyClosure(fromStore, *state.store, RealisedPath::Set{fromPath});
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 1145c2574e56..edc8daafc137 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -1040,6 +1040,9 @@ std::map<StorePath, StorePath> copyPaths(
     CheckSigsFlag checkSigs,
     SubstituteFlag substitute)
 {
+    for (auto & path : storePaths)
+        dstStore.addTempRoot(path);
+
     auto valid = dstStore.queryValidPaths(storePaths, substitute);
 
     StorePathSet missing;