diff --git a/clippy_utils/src/lib.rs b/clippy_utils/src/lib.rs
index 3210581299c..350b231e903 100644
--- a/clippy_utils/src/lib.rs
+++ b/clippy_utils/src/lib.rs
@@ -1509,9 +1509,7 @@ pub fn is_range_full(cx: &LateContext<'_>, expr: &Expr<'_>, container_path: Opti
             if let rustc_ty::Adt(_, subst) = ty.kind()
                 && let bnd_ty = subst.type_at(0)
                 && let Some(min_val) = bnd_ty.numeric_min_val(cx.tcx)
-                && let const_val = cx.tcx.valtree_to_const_val((bnd_ty, min_val.to_valtree()))
-                && let min_const_kind = Const::from_value(const_val, bnd_ty)
-                && let Some(min_const) = mir_to_const(cx, min_const_kind)
+                && let Some(min_const) = mir_to_const(cx, Const::from_ty_const(min_val, cx.tcx))
                 && let Some(start_const) = constant(cx, cx.typeck_results(), start)
             {
                 start_const == min_const
@@ -1525,9 +1523,7 @@ pub fn is_range_full(cx: &LateContext<'_>, expr: &Expr<'_>, container_path: Opti
                     if let rustc_ty::Adt(_, subst) = ty.kind()
                         && let bnd_ty = subst.type_at(0)
                         && let Some(max_val) = bnd_ty.numeric_max_val(cx.tcx)
-                        && let const_val = cx.tcx.valtree_to_const_val((bnd_ty, max_val.to_valtree()))
-                        && let max_const_kind = Const::from_value(const_val, bnd_ty)
-                        && let Some(max_const) = mir_to_const(cx, max_const_kind)
+                        && let Some(max_const) = mir_to_const(cx, Const::from_ty_const(max_val, cx.tcx))
                         && let Some(end_const) = constant(cx, cx.typeck_results(), end)
                     {
                         end_const == max_const