diff --git a/src/rcore.rs b/src/rcore.rs
index 41ea785..98a0d79 100644
--- a/src/rcore.rs
+++ b/src/rcore.rs
@@ -127,7 +127,7 @@ pub type ParseError<'a, Ctx, F> = <F as FactoryBase<'a, Ctx>>::ParseError;
 pub type ParseErrorA<'a, Ctx, A> = ParseError<'a, Ctx, Fctr<'a, Ctx, A>>;
 
 /// Extension trait for factories.
-pub trait FactoryExt<'a, Ctx: Context<'a>>: Factory<'a, Ctx> {
+pub trait FactoryExt<'a, Ctx: Context<'a>>: FactoryBase<'a, Ctx> {
     /// Parse the object from a slice.
     fn parse_slice(
         &self,