1 files changed, 1 insertions, 1 deletions
diff --git a/eval.c b/eval.c
index 3dbbbf03..74ab1703 100644
--- a/eval.c
+++ b/eval.c
@@ -7143,7 +7143,7 @@ void eval_init(void)
   reg_fun(intern(lit("copy-str"), user_package), func_n1(copy_str));
   reg_fun(intern(lit("upcase-str"), user_package), func_n1(upcase_str));
   reg_fun(intern(lit("downcase-str"), user_package), func_n1(downcase_str));
-  reg_fun(intern(lit("string-extend"), user_package), func_n2(string_extend));
+  reg_fun(intern(lit("string-extend"), user_package), func_n3o(string_extend, 2));
   reg_fun(intern(lit("stringp"), user_package), func_n1(stringp));
   reg_fun(intern(lit("lazy-stringp"), user_package), func_n1(lazy_stringp));
   reg_fun(intern(lit("length-str"), user_package), func_n1(length_str));