diff --git a/cpu/z80/z80def.h b/cpu/z80/z80def.h
index 09b953448..bd31addaf 100644
--- a/cpu/z80/z80def.h
+++ b/cpu/z80/z80def.h
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id: z80def.h,v 1.1 2007/09/07 04:59:06 matsutsuka Exp $
+ * $Id: z80def.h,v 1.2 2007/09/19 12:44:01 matsutsuka Exp $
  *
  */
 
@@ -45,7 +45,7 @@
 #define CC_CONF_FUNCTION_POINTER_ARGS	1
 #define CC_CONF_FASTCALL
 #define CC_CONF_VA_ARGS		1
-#define CC_CONF_UNSIGNED_CHAR_BUGS	1
+#define CC_CONF_UNSIGNED_CHAR_BUGS	0
 #define CC_CONF_REGISTER_ARGS		0