diff --git a/intl/uconv/src/nsCharsetConverterManager.cpp b/intl/uconv/src/nsCharsetConverterManager.cpp
index 389737a5a65..9b110be33fa 100644
--- a/intl/uconv/src/nsCharsetConverterManager.cpp
+++ b/intl/uconv/src/nsCharsetConverterManager.cpp
@@ -31,7 +31,7 @@
 #include "registryhack1.h"
 
 // just for CIDs
-// #include "nsIUnicodeEncodeHelper.h"
+#include "nsIUnicodeEncodeHelper.h"
 
 // XXX to be moved with its own factory
 #include "nsIUnicodeDecodeUtil.h"