diff --git a/pd/extra/expr~/vexp_fun.c b/pd/extra/expr~/vexp_fun.c
index 26b0b7675c4b1296370bc3e3d1ca3a93941bbd33..41fca48ef0c87a64e3f66b3d93f0c3075cedfb1c 100644
--- a/pd/extra/expr~/vexp_fun.c
+++ b/pd/extra/expr~/vexp_fun.c
@@ -151,8 +151,8 @@ t_ex_func ex_funcs[] = {
         {"rint",        ex_rint,        1},
         {"float",       ex_tofloat,     1},
         {"fmod",        ex_fmod,        2},
-        {"floor",       ex_floor,       2},
-        {"ceil",        ex_ceil,        2},
+        {"floor",       ex_floor,       1},
+        {"ceil",        ex_ceil,        1},
         {"pow",         ex_pow,         2},
         {"sqrt",        ex_sqrt,        1},
         {"exp",         ex_exp,         1},