diff --git a/tcg/tcg.c b/tcg/tcg.c
index 682af8a..b20ed19 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -2443,7 +2443,7 @@
            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;
         }
     }