diff --git a/lib/chibi/ast.c b/lib/chibi/ast.c
index eb31ad9e..58b2fde4 100644
--- a/lib/chibi/ast.c
+++ b/lib/chibi/ast.c
@@ -519,9 +519,9 @@ sexp sexp_init_library (sexp ctx, sexp self, sexp_sint_t n, sexp env, const char
   sexp_define_accessors(ctx, env, SEXP_REF, 1, "ref-cell", "ref-cell-set!");
   sexp_define_accessors(ctx, env, SEXP_SEQ, 0, "seq-ls", "seq-ls-set!");
   sexp_define_accessors(ctx, env, SEXP_LIT, 0, "lit-value", "lit-value-set!");
-  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 1, "bytecode-name", "bytecode-name-set!");
-  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 2, "bytecode-literals", NULL);
-  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 3, "bytecode-source", NULL);
+  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 2, "bytecode-name", "bytecode-name-set!");
+  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 3, "bytecode-literals", NULL);
+  sexp_define_accessors(ctx, env, SEXP_BYTECODE, 4, "bytecode-source", NULL);
   sexp_define_accessors(ctx, env, SEXP_EXCEPTION, 0, "exception-kind", NULL);
   sexp_define_accessors(ctx, env, SEXP_EXCEPTION, 1, "exception-message", NULL);
   sexp_define_accessors(ctx, env, SEXP_EXCEPTION, 2, "exception-irritants", NULL);