diff --git a/src/mbyte.c b/src/mbyte.c
index a7bf5c1..f881275 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -360,6 +360,12 @@
     {"ucs4be",		IDX_UCS4},
     {"ucs-4be",		IDX_UCS4},
     {"ucs4le",		IDX_UCS4LE},
+    {"utf32",		IDX_UCS4},
+    {"utf-32",		IDX_UCS4},
+    {"utf32be",		IDX_UCS4},
+    {"utf-32be",	IDX_UCS4},
+    {"utf32le",		IDX_UCS4LE},
+    {"utf-32le",	IDX_UCS4LE},
     {"932",		IDX_CP932},
     {"949",		IDX_CP949},
     {"936",		IDX_CP936},