diff --git a/src/lj_crecord.c b/src/lj_crecord.c
index 2b83f3a1..fe08b935 100644
--- a/src/lj_crecord.c
+++ b/src/lj_crecord.c
@@ -1434,6 +1434,7 @@ void LJ_FASTCALL recff_cdata_arith(jit_State *J, RecordFFData *rd)
       }
     } else if (!tref_isnum(tr)) {
       tr = 0;
+      ct = ctype_get(cts, CTID_P_VOID);
     }
   ok:
     s[i] = ct;