diff --git a/ext/win32ole/win32ole.c b/ext/win32ole/win32ole.c
index 1ab525d45f..be5ae826ff 100644
--- a/ext/win32ole/win32ole.c
+++ b/ext/win32ole/win32ole.c
@@ -1311,7 +1311,7 @@ ole_vstr2wc(VALUE vstr)
     enc = rb_enc_get(vstr);
 
     if (st_lookup(enc2cp_table, (st_data_t)enc, &data)) {
-        cp = data;
+        cp = (int)data;
     } else {
         cp = ole_encoding2cp(enc);
         if (code_page_installed(cp) ||