diff --git a/ir.c b/ir.c
index bf08a5d..b564bae 100644
--- a/ir.c
+++ b/ir.c
@@ -2862,7 +2862,7 @@ static bool gen_global_function(ir_builder *ir, ir_value *global)
     fun.locals = vec_size(code_globals) - fun.firstlocal;
 
     if (irfun->builtin)
-        fun.entry = irfun->builtin;
+        fun.entry = irfun->builtin+1;
     else {
         irfun->code_function_def = vec_size(code_functions);
         fun.entry = vec_size(code_statements);
diff --git a/parser.c b/parser.c
index f6a3024..1a5c427 100644
--- a/parser.c
+++ b/parser.c
@@ -4028,7 +4028,7 @@ skipvar:
                 }
                 vec_push(parser->functions, func);
 
-                func->builtin = -parser_token(parser)->constval.i;
+                func->builtin = -parser_token(parser)->constval.i-1;
             }
 
             if (!parser_next(parser)) {