diff --git a/AUTHORS.md b/AUTHORS.md
index 92f1a4a97..778640c0d 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -85,3 +85,4 @@
 -   ([@alxnull](https://github.com/alxnull))
 -   ([@gpetrou](https://github.com/gpetrou))
 -   Ehsan Iran-Nejad ([@eirannejad](https://github.com/eirannejad))
+-   Rolf Madsen ([@rmadsen-ks](https://github.com/rmadsen-ks))
diff --git a/src/python_tests_runner/PythonTestRunner.cs b/src/python_tests_runner/PythonTestRunner.cs
index 05298997b..920219b72 100644
--- a/src/python_tests_runner/PythonTestRunner.cs
+++ b/src/python_tests_runner/PythonTestRunner.cs
@@ -35,6 +35,7 @@ static IEnumerable<string[]> PythonTestCases()
             // Add the test that you want to debug here.
             yield return new[] { "test_indexer", "test_boolean_indexer" };
             yield return new[] { "test_delegate", "test_bool_delegate" };
+            yield return new[] { "test_conversion", "test_object_string_format" };
         }
 
         /// <summary>
diff --git a/src/runtime/PythonTypes/PyInt.cs b/src/runtime/PythonTypes/PyInt.cs
index 6b3dbf210..278056345 100644
--- a/src/runtime/PythonTypes/PyInt.cs
+++ b/src/runtime/PythonTypes/PyInt.cs
@@ -228,7 +228,8 @@ public BigInteger ToBigInteger()
         public string ToString(string format, IFormatProvider formatProvider)
         {
             using var _ = Py.GIL();
-            return ToBigInteger().ToString(format, formatProvider);
+            object val = Runtime.PyLong_AsLongLong(obj);
+            return val?.ToString() ?? ToBigInteger().ToString(format, formatProvider);
         }
 
         public override TypeCode GetTypeCode() => TypeCode.Int64;
diff --git a/tests/test_conversion.py b/tests/test_conversion.py
index bb686dd52..2eebbe7f8 100644
--- a/tests/test_conversion.py
+++ b/tests/test_conversion.py
@@ -752,3 +752,9 @@ def test_explicit_conversion():
         assert int(t(123.4)) == 123
         with pytest.raises(TypeError):
             index(t(123.4))
+
+def test_object_string_format():
+    from System import String
+    integer_value = 200
+    string_value = String.Format("{0}", integer_value)
+    assert string_value == "200", f"{string_value} != ""200"""
diff --git a/tests/test_delegate.py b/tests/test_delegate.py
index 55115203c..7e2f27fed 100644
--- a/tests/test_delegate.py
+++ b/tests/test_delegate.py
@@ -451,3 +451,6 @@ def wrong_return_type(intValue, stringValue):
     # test sig mismatch, both on managed and Python side
 
     # test return wrong type
+
+
+