diff --git a/src/mbyte.c b/src/mbyte.c
index c48da8e..bcfca82 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -363,6 +363,8 @@
     {"932",		IDX_CP932},
     {"949",		IDX_CP949},
     {"936",		IDX_CP936},
+    {"gbk",		IDX_CP936},
+    {"gb18030",		IDX_CP936},	/* only 99% the same */
     {"950",		IDX_CP950},
     {"eucjp",		IDX_EUC_JP},
     {"unix-jis",	IDX_EUC_JP},