diff --git a/src/libutil/archive.cc b/src/libutil/archive.cc
index d9a3afd41..9ddec44cd 100644
--- a/src/libutil/archive.cc
+++ b/src/libutil/archive.cc
@@ -173,8 +173,6 @@ static void parse(FileSystemObjectSink & sink, Source & source, const CanonPath
     s = readString(source);
     if (s != "(") throw badArchive("expected open tag");
 
-    std::map<Path, int, CaseInsensitiveCompare> names;
-
     auto getString = [&]() {
         checkInterrupt();
         return readString(source);
@@ -215,6 +213,8 @@ static void parse(FileSystemObjectSink & sink, Source & source, const CanonPath
             else if (t == "directory") {
                 sink.createDirectory(path);
 
+                std::map<Path, int, CaseInsensitiveCompare> names;
+
                 std::string prevName;
 
                 while (1) {