diff --git a/intl/locale/src/windows/nsDateTimeFormatWin.cpp b/intl/locale/src/windows/nsDateTimeFormatWin.cpp
index 1f1f01659523..54c6ea21329e 100644
--- a/intl/locale/src/windows/nsDateTimeFormatWin.cpp
+++ b/intl/locale/src/windows/nsDateTimeFormatWin.cpp
@@ -30,6 +30,9 @@ static NS_DEFINE_CID(kWin32LocaleFactoryCID, NS_WIN32LOCALEFACTORY_CID);
 static NS_DEFINE_IID(kIWin32LocaleIID, NS_IWIN32LOCALE_IID);
 static NS_DEFINE_IID(kIDateTimeFormatIID, NS_IDATETIMEFORMAT_IID);
 
+static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
+static NS_DEFINE_IID(kICharsetConverterManagerIID, NS_ICHARSETCONVERTERMANAGER_IID);
+
 NS_IMPL_ISUPPORTS(nsDateTimeFormatWin, kIDateTimeFormatIID);