diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index f4b1a2450..40daa2d0b 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -997,6 +997,7 @@ pub fn opt_def_id(def: Def) -> Option<DefId> {
         | Def::TyAlias(id)
         | Def::AssociatedTy(id)
         | Def::TyParam(id)
+        | Def::ConstParam(id)
         | Def::ForeignTy(id)
         | Def::Struct(id)
         | Def::StructCtor(id, ..)