diff --git a/include/__locale b/include/__locale
index d382e4d..2b6982f 100644
--- a/include/__locale
+++ b/include/__locale
@@ -409,7 +409,7 @@
     static const mask xdigit = _ISxdigit;
     static const mask blank  = _ISblank;
 #if defined(__mips__)
-    static const mask __regex_word = static_cast<char_class_type>(_ISbit(15));
+    static const mask __regex_word = static_cast<mask>(_ISbit(15));
 #else
     static const mask __regex_word = 0x80;
 #endif