diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index e0ed66894..a3b0e928a 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -924,6 +924,7 @@ pub fn opt_def_id(def: Def) -> Option<DefId> {
         Def::TyAlias(id) |
         Def::AssociatedTy(id) |
         Def::TyParam(id) |
+        Def::TyForeign(id) |
         Def::Struct(id) |
         Def::StructCtor(id, ..) |
         Def::Union(id) |