diff --git a/src/libfetchers/fetchers.hh b/src/libfetchers/fetchers.hh
index c43cfe50c..2e8c534b0 100644
--- a/src/libfetchers/fetchers.hh
+++ b/src/libfetchers/fetchers.hh
@@ -16,6 +16,8 @@ struct Tree
 {
     Path actualPath;
     StorePath storePath;
+    Tree(Path && actualPath, StorePath && storePath) : actualPath(actualPath), storePath(std::move(storePath)) {}
+    Tree (const Tree & rhs) : actualPath(rhs.actualPath), storePath(rhs.storePath.clone()) {}
 };
 
 struct InputScheme;