diff --git a/tmp-objdir.c b/tmp-objdir.c
index 0eaa79ffd7..deaaf6ba2e 100644
--- a/tmp-objdir.c
+++ b/tmp-objdir.c
@@ -321,11 +321,6 @@ const char **tmp_objdir_env(const struct tmp_objdir *t)
 	return t->env.v;
 }
 
-void tmp_objdir_add_as_alternate(const struct tmp_objdir *t)
-{
-	odb_add_to_alternates_memory(t->repo->objects, t->path.buf);
-}
-
 struct odb_source *tmp_objdir_replace_primary_odb(struct tmp_objdir *t,
 						  int will_destroy)
 {
diff --git a/tmp-objdir.h b/tmp-objdir.h
index 81eb927413..05f0d08d10 100644
--- a/tmp-objdir.h
+++ b/tmp-objdir.h
@@ -55,12 +55,6 @@ int tmp_objdir_destroy(struct tmp_objdir *);
  */
 void tmp_objdir_discard_objects(struct tmp_objdir *);
 
-/*
- * Add the temporary object directory as an alternate object store in the
- * current process.
- */
-void tmp_objdir_add_as_alternate(const struct tmp_objdir *);
-
 /*
  * Replaces the writable object store in the current process with the temporary
  * object directory and makes the former main object store an alternate.