diff --git a/mailnews/base/src/nsMessengerMigrator.cpp b/mailnews/base/src/nsMessengerMigrator.cpp
index ac8783c574f..d68e591705b 100644
--- a/mailnews/base/src/nsMessengerMigrator.cpp
+++ b/mailnews/base/src/nsMessengerMigrator.cpp
@@ -665,6 +665,7 @@ nsMessengerMigrator::UpgradePrefs()
     if (NS_FAILED(rv)) return rv;
 
 	// remove the temporary identity we used for migration purposes
+    identity->ClearAllValues();
     rv = accountManager->RemoveIdentity(identity);
     return rv;
 }