diff --git a/test_suite/tests/test_value.rs b/test_suite/tests/test_value.rs
index acd3ddd6..80554663 100644
--- a/test_suite/tests/test_value.rs
+++ b/test_suite/tests/test_value.rs
@@ -25,3 +25,21 @@ fn test_u32_to_enum() {
     let e: E = E::deserialize(deserializer).unwrap();
     assert_eq!(E::B, e);
 }
+
+#[test]
+fn test_integer128() {
+    let de_u128 = IntoDeserializer::<value::Error>::into_deserializer(1u128);
+    let de_i128 = IntoDeserializer::<value::Error>::into_deserializer(1i128);
+
+    // u128 to u128
+    assert_eq!(1u128, u128::deserialize(de_u128.clone()).unwrap());
+
+    // u128 to i128
+    assert_eq!(1i128, i128::deserialize(de_u128.clone()).unwrap());
+
+    // i128 to u128
+    assert_eq!(1u128, u128::deserialize(de_i128.clone()).unwrap());
+
+    // i128 to i128
+    assert_eq!(1i128, i128::deserialize(de_i128.clone()).unwrap());
+}