diff --git a/compiler/rustc_type_ir/src/predicate.rs b/compiler/rustc_type_ir/src/predicate.rs
index ab4677fa0a5fb..113192cc02eb8 100644
--- a/compiler/rustc_type_ir/src/predicate.rs
+++ b/compiler/rustc_type_ir/src/predicate.rs
@@ -420,6 +420,7 @@ pub struct ExistentialProjection<I: Interner> {
 
     /// This field exists to prevent the creation of `ExistentialProjection`
     /// without using [`ExistentialProjection::new_from_args`].
+    #[derive_where(skip(Debug))]
     use_existential_projection_new_instead: (),
 }