diff --git a/target-i386/translate.c b/target-i386/translate.c
index 0a7e4e34879ea68443ea6cb3e867e8f9c08d2980..ee7585044bbe5e5ae78646ba99b8e0007aeb213c 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -7768,7 +7768,7 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start)
             goto illegal_op;
 
         modrm = cpu_ldub_code(cpu_single_env, s->pc++);
-        reg = ((modrm >> 3) & 7);
+        reg = ((modrm >> 3) & 7) | rex_r;
 
         if (s->prefix & PREFIX_DATA)
             ot = OT_WORD;