1 files changed, 2 insertions, 2 deletions
diff --git a/eval.c b/eval.c
index 2f803a70..c6022329 100644
--- a/eval.c
+++ b/eval.c
@@ -6400,8 +6400,8 @@ void eval_init(void)
   reg_fun(plus_s = intern(lit("+"), user_package), func_n0v(plusv));
   reg_fun(intern(lit("-"), user_package), func_n1v(minusv));
   reg_fun(intern(lit("*"), user_package), func_n0v(mulv));
-  reg_fun(intern(lit("sum"), user_package), func_n1(sum));
-  reg_fun(intern(lit("prod"), user_package), func_n1(prod));
+  reg_fun(intern(lit("sum"), user_package), func_n2o(sum, 1));
+  reg_fun(intern(lit("prod"), user_package), func_n2o(prod, 1));
   reg_fun(intern(lit("abs"), user_package), func_n1(abso));
   reg_fun(intern(lit("trunc"), user_package), func_n2o(trunc, 1));
   reg_fun(intern(lit("mod"), user_package), func_n2(mod));