diff --git a/tests/kani/SaturatingIntrinsics/main.rs b/tests/kani/Intrinsics/Saturating/main.rs
similarity index 91%
rename from tests/kani/SaturatingIntrinsics/main.rs
rename to tests/kani/Intrinsics/Saturating/main.rs
index 08326922a990..413db77bac22 100644
--- a/tests/kani/SaturatingIntrinsics/main.rs
+++ b/tests/kani/Intrinsics/Saturating/main.rs
@@ -1,5 +1,9 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0 OR MIT
+
+// Check that `saturating_add` and `saturating_sub` are supported and return the
+// expected results.
+
 #![feature(core_intrinsics)]
 use std::intrinsics;
 
@@ -54,10 +58,12 @@ fn main() {
     test_saturating_intrinsics!(u16);
     test_saturating_intrinsics!(u32);
     test_saturating_intrinsics!(u64);
+    test_saturating_intrinsics!(u128);
     test_saturating_intrinsics!(usize);
     test_saturating_intrinsics!(i8);
     test_saturating_intrinsics!(i16);
     test_saturating_intrinsics!(i32);
     test_saturating_intrinsics!(i64);
+    test_saturating_intrinsics!(i128);
     test_saturating_intrinsics!(isize);
 }
diff --git a/tests/kani/SaturatingIntrinsics/add_128.rs b/tests/kani/SaturatingIntrinsics/add_128.rs
deleted file mode 100644
index f65c12c0c60d..000000000000
--- a/tests/kani/SaturatingIntrinsics/add_128.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
-// SPDX-License-Identifier: Apache-2.0 OR MIT
-// Currently fails with thread 'rustc' panicked at 'assertion failed: w < 128', compiler/rustc_codegen_llvm/src/gotoc/cbmc/goto_program/typ.rs:508:9
-
-#![feature(core_intrinsics)]
-use std::intrinsics;
-
-fn main() {
-    let v: u128 = kani::any();
-    let w: u128 = kani::any();
-    intrinsics::saturating_add(v, w);
-}