diff --git a/profile/pref-migrator/public/nsIPrefMigration.idl b/profile/pref-migrator/public/nsIPrefMigration.idl
index d6f51d9d4cfa..a2f503d06bfe 100644
--- a/profile/pref-migrator/public/nsIPrefMigration.idl
+++ b/profile/pref-migrator/public/nsIPrefMigration.idl
@@ -56,5 +56,5 @@ interface nsIPrefMigration: nsISupports
 [scriptable, uuid(88fabfa4-1dd2-11b2-94a1-902f0abd94b1)]
 interface nsIPrefConverter: nsISupports
 {
-    void ConvertPrefsToUTF8IfNecessary();
+    void ConvertPrefsToUTF8();
 };