diff --git a/src/so_ast_to_fcode.erl b/src/so_ast_to_fcode.erl
index 7840d94..35c6607 100644
--- a/src/so_ast_to_fcode.erl
+++ b/src/so_ast_to_fcode.erl
@@ -335,7 +335,8 @@ init_type_env() ->
                         [address, integer],
                         [integer],
                         [{list, {tuple, [{variant, [[], [address]]}, address, address, integer]}}],
-                        [address, integer, string, {list, {tuple, [address, integer]}}]
+                        [address, integer, string, {list, {tuple, [address, integer]}}],
+                        [integer]
                        ]},
     #{ ["int"]             => ?type(integer),
        ["bool"]            => ?type(boolean),