diff --git a/crates/toml/tests/testsuite/serde.rs b/crates/toml/tests/testsuite/serde.rs
index 8bbff56e..61c03f9f 100644
--- a/crates/toml/tests/testsuite/serde.rs
+++ b/crates/toml/tests/testsuite/serde.rs
@@ -945,6 +945,20 @@ fn integer_min() {
     }
 }
 
+#[test]
+fn integer_too_big() {
+    #[derive(Serialize, Deserialize, PartialEq, Debug, Clone)]
+    struct Foo {
+        a_b: u64,
+    }
+
+    let native = Foo { a_b: u64::MAX };
+    let err = Table::try_from(native.clone()).unwrap_err();
+    snapbox::assert_eq("u64 value was too large", err.to_string());
+    let err = toml::to_string(&native).unwrap();
+    snapbox::assert_eq("a_b = -1\n", err.to_string());
+}
+
 #[test]
 fn integer_max() {
     #[derive(Serialize, Deserialize, PartialEq, Debug, Clone)]