diff --git a/src/rstd/fallible.rs b/src/rstd/fallible.rs
index f7c3dc8..ce451de 100644
--- a/src/rstd/fallible.rs
+++ b/src/rstd/fallible.rs
@@ -7,7 +7,7 @@ use crate::func::context::*;
 use super::*;
 
 /// Preferred monad for fallible uses.
-pub type FallibleMonad<'a, Ctx, E> = <<Ctx as Context<'a>>::Fallible as MonadFailAny<'a>>::W<E>;
+pub type FallibleMonad<'a, Ctx, E> = <<Ctx as FallibleCtx<'a>>::Fallible as MonadFailAny<'a>>::W<E>;
 
 /// Preferred [Wrapped] [Result].
 pub type FallibleWrapped<'a, Ctx, A, E> = Wrap<'a, A, FallibleMonad<'a, Ctx, E>>;