diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index b6abc60a00b1aaa40818228e31e4140114bb1230..f40b5a1abf7338a6e092ea7307ab189a8124a8b4 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -818,7 +818,7 @@ static inline void gen_op_arith_compute_ov(DisasContext *ctx, TCGv arg0,
         if (is_isa300(ctx)) {
             tcg_gen_extract_tl(cpu_ov32, cpu_ov, 31, 1);
         }
-        tcg_gen_extract_tl(cpu_ov, cpu_ov, 63, 1);
+        tcg_gen_extract_tl(cpu_ov, cpu_ov, TARGET_LONG_BITS - 1, 1);
     }
     tcg_gen_or_tl(cpu_so, cpu_so, cpu_ov);
 }