#include "cache.h"
 #include "strbuf.h"
 #include "quote.h"
+#include "tree.h"
 
 static struct treeent {
        unsigned mode;
                memcpy(buffer + offset, ent->sha1, 20);
                offset += 20;
        }
-       write_sha1_file(buffer, offset, "tree", sha1);
+       write_sha1_file(buffer, offset, tree_type, sha1);
 }
 
 static const char mktree_usage[] = "mktree [-z]";