diff --git a/src/parser/nom_context.rs b/src/parser/nom_context.rs
index e62d73fe..ced63e8b 100644
--- a/src/parser/nom_context.rs
+++ b/src/parser/nom_context.rs
@@ -42,7 +42,7 @@ where
     }
 
     pub fn with_additional_fail_matcher<G>(
-        self,
+        &self,
         mut additional_fail_matcher: G,
     ) -> NomContext<
         impl Clone + for<'o> FnMut(&'o str) -> IResult<&'o str, &'o str, VerboseError<&'o str>>,