1 files changed, 2 insertions, 0 deletions
diff --git a/encoding.c b/encoding.c
index 2f77f02d08..457d940dd7 100644
--- a/encoding.c
+++ b/encoding.c
@@ -792,6 +792,8 @@ rb_locale_charmap(VALUE klass)
     char *codeset;
     codeset = nl_langinfo(CODESET);
     return rb_str_new2(codeset);
+#elif defined _WIN32
+    return rb_sprintf("CP%d", GetACP());
 #else
     return Qnil;
 #endif