diff --git a/mozilla/profile/pref-migrator/src/nsPrefMigration.cpp b/mozilla/profile/pref-migrator/src/nsPrefMigration.cpp
index fa7efb8eaa6..7dd7f47427a 100644
--- a/mozilla/profile/pref-migrator/src/nsPrefMigration.cpp
+++ b/mozilla/profile/pref-migrator/src/nsPrefMigration.cpp
@@ -241,8 +241,6 @@ typedef struct
 /*-----------------------------------------------------------------
  * Globals
  *-----------------------------------------------------------------*/
-static NS_DEFINE_IID(kProxyObjectManagerCID, NS_PROXYEVENT_MANAGER_CID);
-
 static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
 
 static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);