diff --git a/xpcom/base/IIDS.h b/xpcom/base/IIDS.h
index b1d1a6fc5c4d..5a6560f566b2 100644
--- a/xpcom/base/IIDS.h
+++ b/xpcom/base/IIDS.h
@@ -1133,7 +1133,7 @@ nsIDOMNSLocation = { /* a6cf9108-15b3-11d2-932e-00805f8add32 */
     0x11d2,
     {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}
   };
-INTERFACENAME = { /* a6cf9109-15b3-11d2-932e-00805f8add32 */
+nsTextConverter = { /* a6cf9109-15b3-11d2-932e-00805f8add32 */
     0xa6cf9109,
     0x15b3,
     0x11d2,