diff --git a/lix/libutil/file-system.cc b/lix/libutil/file-system.cc
index ebb46549e..36fe09748 100644
--- a/lix/libutil/file-system.cc
+++ b/lix/libutil/file-system.cc
@@ -706,6 +706,11 @@ Path makeTempPath(const Path & root, const Path & suffix)
     return fmt("%1%%2%-%3%-%4%", root, suffix, getpid(), counter.fetch_add(1, std::memory_order_relaxed));
 }
 
+Path makeTempSiblingPath(const Path & path)
+{
+    return makeTempPath(fs::path(path).remove_filename());
+}
+
 void createSymlink(const Path & target, const Path & link)
 {
     if (sys::symlink(target, link)) {
diff --git a/lix/libutil/file-system.hh b/lix/libutil/file-system.hh
index 8b9100bdc..395eed0ea 100644
--- a/lix/libutil/file-system.hh
+++ b/lix/libutil/file-system.hh
@@ -318,6 +318,11 @@ Path createTempSubdir(const Path & parent, const Path & prefix = "nix",
  */
 Path makeTempPath(const Path & root, const Path & suffix = ".tmp");
 
+/**
+ * Return temporary path in the same directory as a given path.
+ */
+Path makeTempSiblingPath(const Path & path);
+
 /**
  * Used in various places.
  */