diff --git a/qemu/tcg/tcg.c b/qemu/tcg/tcg.c
index 6e643a11..da81ddae 100644
--- a/qemu/tcg/tcg.c
+++ b/qemu/tcg/tcg.c
@@ -2488,7 +2488,7 @@ int tcg_gen_code(TCGContext *s, tcg_insn_unit *gen_code_buf)
            one operation beginning below the high water mark cannot overrun
            the buffer completely.  Thus we can test for overflow after
            generating code without having to check during generation.  */
-        if (unlikely(s->code_gen_ptr > s->code_gen_highwater)) {
+        if (unlikely((void *)s->code_ptr > s->code_gen_highwater)) {
             return -1;
         }
     }