1 files changed, 5 insertions, 3 deletions

diff --git a/src/lj_crecord.c b/src/lj_crecord.c
index be23cd62..b0de5423 100644
--- a/src/lj_crecord.c
+++ b/src/lj_crecord.c
@@ -616,10 +616,12 @@ static TRef crec_ct_tv(jit_State *J, CType *d, TRef dp, TRef sp, cTValue *sval)
     sp = lj_ir_kptr(J, NULL);
   } else if (tref_isudata(sp)) {
     GCudata *ud = udataV(sval);
-    if (ud->udtype == UDTYPE_IO_FILE) {
+    if (ud->udtype == UDTYPE_IO_FILE || ud->udtype == UDTYPE_BUFFER) {
       TRef tr = emitir(IRT(IR_FLOAD, IRT_U8), sp, IRFL_UDATA_UDTYPE);
-      emitir(IRTGI(IR_EQ), tr, lj_ir_kint(J, UDTYPE_IO_FILE));
-      sp = emitir(IRT(IR_FLOAD, IRT_PTR), sp, IRFL_UDATA_FILE);
+      emitir(IRTGI(IR_EQ), tr, lj_ir_kint(J, ud->udtype));
+      sp = emitir(IRT(IR_FLOAD, IRT_PTR), sp,
+                  ud->udtype == UDTYPE_IO_FILE ? IRFL_UDATA_FILE :
+                                                 IRFL_UDATA_BUF_R);
     } else {
       sp = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, sizeof(GCudata)));
     }