diff --git a/clippy_lints/src/dereference.rs b/clippy_lints/src/dereference.rs
index 38329659e02..ad5a1b2beb7 100644
--- a/clippy_lints/src/dereference.rs
+++ b/clippy_lints/src/dereference.rs
@@ -1330,7 +1330,7 @@ fn replace_types<'tcx>(
                     && let Some(term_ty) = projection_predicate.term.ty()
                     && let ty::Param(term_param_ty) = term_ty.kind()
                 {
-                    let item_def_id = projection_predicate.projection_ty.item_def_id;
+                    let item_def_id = projection_predicate.projection_ty.def_id;
                     let assoc_item = cx.tcx.associated_item(item_def_id);
                     let projection = cx.tcx
                         .mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(new_ty, []));
diff --git a/clippy_lints/src/len_zero.rs b/clippy_lints/src/len_zero.rs
index 4c133c06a15..982f99c2716 100644
--- a/clippy_lints/src/len_zero.rs
+++ b/clippy_lints/src/len_zero.rs
@@ -493,7 +493,7 @@ fn has_is_empty(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
                 .filter_by_name_unhygienic(is_empty)
                 .any(|item| is_is_empty(cx, item))
         }),
-        ty::Projection(ref proj) => has_is_empty_impl(cx, proj.item_def_id),
+        ty::Projection(ref proj) => has_is_empty_impl(cx, proj.def_id),
         ty::Adt(id, _) => has_is_empty_impl(cx, id.did()),
         ty::Array(..) | ty::Slice(..) | ty::Str => true,
         _ => false,
diff --git a/clippy_lints/src/methods/needless_collect.rs b/clippy_lints/src/methods/needless_collect.rs
index b088e642e0e..f4d3ef3b742 100644
--- a/clippy_lints/src/methods/needless_collect.rs
+++ b/clippy_lints/src/methods/needless_collect.rs
@@ -151,7 +151,7 @@ fn iterates_same_ty<'tcx>(cx: &LateContext<'tcx>, iter_ty: Ty<'tcx>, collect_ty:
         && let Some(into_iter_item_proj) = make_projection(cx.tcx, into_iter_trait, item, [collect_ty])
         && let Ok(into_iter_item_ty) = cx.tcx.try_normalize_erasing_regions(
             cx.param_env,
-            cx.tcx.mk_projection(into_iter_item_proj.item_def_id, into_iter_item_proj.substs)
+            cx.tcx.mk_projection(into_iter_item_proj.def_id, into_iter_item_proj.substs)
         )
     {
         iter_item_ty == into_iter_item_ty
diff --git a/clippy_utils/src/ty.rs b/clippy_utils/src/ty.rs
index f5f70b195c9..11e41d1958c 100644
--- a/clippy_utils/src/ty.rs
+++ b/clippy_utils/src/ty.rs
@@ -685,7 +685,7 @@ fn sig_from_bounds<'tcx>(
                 inputs = Some(i);
             },
             PredicateKind::Clause(ty::Clause::Projection(p))
-                if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output()
+                if Some(p.projection_ty.def_id) == lang_items.fn_once_output()
                     && p.projection_ty.self_ty() == ty =>
             {
                 if output.is_some() {
@@ -708,7 +708,7 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
 
     for (pred, _) in cx
         .tcx
-        .bound_explicit_item_bounds(ty.item_def_id)
+        .bound_explicit_item_bounds(ty.def_id)
         .subst_iter_copied(cx.tcx, ty.substs)
     {
         match pred.kind().skip_binder() {
@@ -726,7 +726,7 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
                 inputs = Some(i);
             },
             PredicateKind::Clause(ty::Clause::Projection(p))
-                if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output() =>
+                if Some(p.projection_ty.def_id) == lang_items.fn_once_output() =>
             {
                 if output.is_some() {
                     // Multiple different fn trait impls. Is this even allowed?
@@ -1041,7 +1041,7 @@ pub fn make_projection<'tcx>(
 
         Some(ProjectionTy {
             substs,
-            item_def_id: assoc_item.def_id,
+            def_id: assoc_item.def_id,
         })
     }
     helper(
@@ -1081,7 +1081,7 @@ pub fn make_normalized_projection<'tcx>(
             );
             return None;
         }
-        match tcx.try_normalize_erasing_regions(param_env, tcx.mk_projection(ty.item_def_id, ty.substs)) {
+        match tcx.try_normalize_erasing_regions(param_env, tcx.mk_projection(ty.def_id, ty.substs)) {
             Ok(ty) => Some(ty),
             Err(e) => {
                 debug_assert!(false, "failed to normalize type `{ty}`: {e:#?}");