diff --git a/crates/hir_ty/src/lower.rs b/crates/hir_ty/src/lower.rs
index 9e69785ac2..0854d06548 100644
--- a/crates/hir_ty/src/lower.rs
+++ b/crates/hir_ty/src/lower.rs
@@ -712,7 +712,7 @@ impl<'a> TyLoweringContext<'a> {
                 .filter(|arg| !matches!(arg, GenericArg::Lifetime(_)))
                 .skip(skip)
                 .take(expected_num)
-                .zip(def_generics.iter_id().skip(skip))
+                .zip(def_generics.iter_id().skip(parent_params + skip))
             {
                 if let Some(x) = generic_arg_to_chalk(
                     self.db,
diff --git a/crates/hir_ty/src/tests/regression.rs b/crates/hir_ty/src/tests/regression.rs
index 63faecbfaf..7a7470fd35 100644
--- a/crates/hir_ty/src/tests/regression.rs
+++ b/crates/hir_ty/src/tests/regression.rs
@@ -1454,3 +1454,26 @@ fn regression_11688_1() {
         "#,
     );
 }
+
+#[test]
+fn regression_11688_2() {
+    check_types(
+        r#"
+        union MaybeUninit<T> {
+            uninit: (),
+            value: T,
+        }
+
+        impl<T> MaybeUninit<T> {
+            fn uninit_array<const LEN: usize>() -> [Self; LEN] {
+                loop {}
+            }
+        }
+
+        fn main() {
+            let x = MaybeUninit::<i32>::uninit_array::<1>();
+              //^ [MaybeUninit<i32>; 1]
+        }
+        "#,
+    );
+}