1 files changed, 1 insertions, 1 deletions

diff --git a/src/lj_crecord.c b/src/lj_crecord.c
index df98e6ec..4f0dfa9a 100644
--- a/src/lj_crecord.c
+++ b/src/lj_crecord.c
@@ -1514,7 +1514,7 @@ void LJ_FASTCALL recff_ffi_string(jit_State *J, RecordFFData *rd)
   TRef tr = J->base[0];
   if (tr) {
     TRef trlen = J->base[1];
-    if (trlen) {
+    if (!tref_isnil(trlen)) {
       trlen = crec_toint(J, cts, trlen, &rd->argv[1]);
       tr = crec_ct_tv(J, ctype_get(cts, CTID_P_CVOID), 0, tr, &rd->argv[0]);
     } else {