1 files changed, 1 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index fd5a720f..b1bb0d17 100644
--- a/eval.c
+++ b/eval.c
@@ -4471,6 +4471,7 @@ void eval_init(void)
   reg_fun(intern(lit("reverse"), user_package), func_n1(reverse));
   reg_fun(intern(lit("ldiff"), user_package), func_n2(ldiff));
   reg_fun(intern(lit("last"), user_package), func_n1(last));
+  reg_fun(intern(lit("butlast"), user_package), func_n1(butlast));
   reg_fun(intern(lit("nthcdr"), user_package), func_n2(nthcdr));
   reg_fun(intern(lit("flatten"), user_package), func_n1(flatten));
   reg_fun(intern(lit("flatten*"), user_package), func_n1(lazy_flatten));