diff --git a/clippy_lints/src/consts.rs b/clippy_lints/src/consts.rs
index 891cb69bb56..e6ef54f528f 100644
--- a/clippy_lints/src/consts.rs
+++ b/clippy_lints/src/consts.rs
@@ -332,7 +332,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
                 let result = self
                     .lcx
                     .tcx
-                    .const_eval_resolve(self.param_env, ty::WithOptConstParam::dummy(def_id), substs, None, None)
+                    .const_eval_resolve(self.param_env, ty::WithOptConstParam::unknown(def_id), substs, None, None)
                     .ok()
                     .map(|val| rustc_middle::ty::Const::from_value(self.lcx.tcx, val, ty))?;
                 let result = miri_to_const(&result);