diff --git a/compiler/rustc_hir_analysis/src/collect.rs b/compiler/rustc_hir_analysis/src/collect.rs
index 10922d53479..5cd6862786b 100644
--- a/compiler/rustc_hir_analysis/src/collect.rs
+++ b/compiler/rustc_hir_analysis/src/collect.rs
@@ -595,12 +595,14 @@ fn convert_item(tcx: TyCtxt<'_>, item_id: hir::ItemId) {
             tcx.ensure().type_of(def_id);
             tcx.ensure().impl_trait_header(def_id);
             tcx.ensure().predicates_of(def_id);
+            tcx.ensure().associated_items(def_id);
         }
         hir::ItemKind::Trait(..) => {
             tcx.ensure().generics_of(def_id);
             tcx.ensure().trait_def(def_id);
             tcx.at(it.span).super_predicates_of(def_id);
             tcx.ensure().predicates_of(def_id);
+            tcx.ensure().associated_items(def_id);
         }
         hir::ItemKind::TraitAlias(..) => {
             tcx.ensure().generics_of(def_id);
diff --git a/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.rs b/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.rs
new file mode 100644
index 00000000000..35a6acca52c
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.rs
@@ -0,0 +1,13 @@
+trait Iterable {
+    type Item;
+    fn iter(&self) -> impl Sized;
+}
+
+// `ty::Error` in a trait ref will silence any missing item errors, but will also
+// prevent the `associated_items` query from being called before def ids are frozen.
+impl Iterable for Missing {
+//~^ ERROR cannot find type `Missing` in this scope
+    fn iter(&self) -> Self::Item {}
+}
+
+fn main() {}
diff --git a/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.stderr b/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.stderr
new file mode 100644
index 00000000000..c172787e6ef
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/ensure-rpitits-are-created-before-freezing.stderr
@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `Missing` in this scope
+  --> $DIR/ensure-rpitits-are-created-before-freezing.rs:8:19
+   |
+LL | impl Iterable for Missing {
+   |                   ^^^^^^^ not found in this scope
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0412`.