diff --git a/src/rstd/external_points.rs b/src/rstd/external_points.rs
index ee07189..db63a8e 100644
--- a/src/rstd/external_points.rs
+++ b/src/rstd/external_points.rs
@@ -8,8 +8,9 @@ pub trait ExternalPointsProxy<'a, Ctx: Context<'a>, T>: FactoryProxy<'a, Ctx> {
     fn exp_points_typed(mentionable: &T, points: &mut impl PointsVisitor<'a, Ctx>);
 }
 
-impl<'a, Ctx: Context<'a>, A: Mentionable<'a, Ctx>, T> ExternalPoints<'a, Ctx, T> for A
+impl<'a, Ctx: Context<'a>, A: MentionableBase<'a, Ctx>, T> ExternalPoints<'a, Ctx, T> for A
 where
+    Fctr<'a, Ctx, A>: WithParseMode,
     <Fctr<'a, Ctx, A> as WithParseMode>::WithMode:
         ExternalPointsProxy<'a, Ctx, T, F = Fctr<'a, Ctx, A>>,
 {