diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index 2a3b50c79bb..22caff1e8d9 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -522,7 +522,7 @@ rustc_queries! {
     }
     query adt_def(key: DefId) -> &'tcx ty::AdtDef {
         desc { |tcx| "computing ADT definition for `{}`", tcx.def_path_str(key) }
-        cache_on_disk_if { true }
+        cache_on_disk_if { key.is_local() }
         separate_provide_extern
     }
     query adt_destructor(key: DefId) -> Option<ty::Destructor> {