diff --git a/src/libexpr/primops/fetchTree.cc b/src/libexpr/primops/fetchTree.cc
index 66cbd6283..584dc2806 100644
--- a/src/libexpr/primops/fetchTree.cc
+++ b/src/libexpr/primops/fetchTree.cc
@@ -225,7 +225,7 @@ static void fetchTree(
             params.emptyRevFallback,
             false);
 
-        //state.allowPath(tree.storePath);
+        state.allowPath(tree.storePath);
     }
 }
 
diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index 711319659..4379d497c 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -71,7 +71,8 @@ std::optional<std::string> readHead(const Path & path)
     });
     if (status != 0) return std::nullopt;
 
-    std::string_view line = output.substr(0, line.find("\n"));
+    std::string_view line = output;
+    line = line.substr(0, line.find("\n"));
     if (const auto parseResult = git::parseLsRemoteLine(line)) {
         switch (parseResult->kind) {
             case git::LsRemoteRefLine::Kind::Symbolic: