diff --git a/src/lj_record.c b/src/lj_record.c
index 47d7115b..12b76bba 100644
--- a/src/lj_record.c
+++ b/src/lj_record.c
@@ -1060,7 +1060,7 @@ static void rec_idx_abc(jit_State *J, TRef asizeref, TRef ikey, uint32_t asize)
       lua_assert(irt_isint(J->scev.t) && ir->o == IR_SLOAD);
       stop = numberVint(&(J->L->base - J->baseslot)[ir->op1 + FORL_STOP]);
       /* Runtime value for stop of loop is within bounds? */
-      if ((int64_t)stop + ofs < (int64_t)asize) {
+      if ((uint64_t)stop + ofs < (uint64_t)asize) {
 	/* Emit invariant bounds check for stop. */
 	emitir(IRTG(IR_ABC, IRT_P32), asizeref, ofs == 0 ? J->scev.stop :
 	       emitir(IRTI(IR_ADD), J->scev.stop, ofsref));