diff --git a/src/func/classes/composition.rs b/src/func/classes/composition.rs
index 0d9db99..744b4a6 100644
--- a/src/func/classes/composition.rs
+++ b/src/func/classes/composition.rs
@@ -72,7 +72,7 @@ impl<U: ApplicativeTuple, V: ApplicativeTuple> ApplicativeTuple for CompositionC
     }
 }
 
-impl<U: ApplicativeSelect, V: ApplicativeSelect> ApplicativeSelect for CompositionClass<U, V> {
+impl<U: ApplicativeSelect, V: Functor> ApplicativeSelect for CompositionClass<U, V> {
     fn select<'a, A: 'a, B: 'a, C: 'a>(
         f: impl 'a + FnOnce(Selected<'a, A, B, Self>) -> C,
         fa: Self::F<'a, A>,