diff --git a/mozilla/intl/uconv/tests/nsTestUConv.cpp b/mozilla/intl/uconv/tests/nsTestUConv.cpp
index e5163b7eb16..b32dcf2920a 100644
--- a/mozilla/intl/uconv/tests/nsTestUConv.cpp
+++ b/mozilla/intl/uconv/tests/nsTestUConv.cpp
@@ -35,6 +35,7 @@
 
 static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
 static NS_DEFINE_IID(kICharsetConverterManagerIID, NS_ICHARSETCONVERTERMANAGER_IID);
+static NS_DEFINE_CID(kPlatformCharsetCID, NS_PLATFORMCHARSET_CID);
 
 //#define TEST_IS_REPRESENTABLE