diff --git a/clippy_utils/src/ty.rs b/clippy_utils/src/ty.rs
index c8d56a3be..9525c7831 100644
--- a/clippy_utils/src/ty.rs
+++ b/clippy_utils/src/ty.rs
@@ -648,7 +648,7 @@ pub fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'t
         },
         ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.bound_fn_sig(id).subst(cx.tcx, subs), Some(id))),
         ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => {
-            sig_from_bounds(cx, ty, cx.tcx.item_bounds(def_id), cx.tcx.opt_parent(def_id))
+            sig_from_bounds(cx, ty, cx.tcx.bound_item_bounds(def_id).subst_identity(), cx.tcx.opt_parent(def_id))
         },
         ty::FnPtr(sig) => Some(ExprFnSig::Sig(sig, None)),
         ty::Dynamic(bounds, _, _) => {