diff --git a/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs b/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
index 6c9e288d..22e093de 100644
--- a/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
+++ b/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
@@ -97,7 +97,7 @@ public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOpt
         else if (typeof(TValue) == typeof(bool))
             writer.WriteBooleanValue((bool)(object)value.Value);
         else if (typeof(TValue) == typeof(short))
-            writer.WriteNumberValue((int)(short)(object)value.Value);
+            writer.WriteNumberValue((short)(object)value.Value);
         else if (typeof(TValue) == typeof(int))
             writer.WriteNumberValue((int)(object)value.Value);
         else if (typeof(TValue) == typeof(double))
@@ -106,6 +106,8 @@ public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOpt
             writer.WriteNumberValue((decimal)(object)value.Value);
         else if (typeof(TValue) == typeof(ulong))
             writer.WriteNumberValue((ulong)(object)value.Value);
+        else if (typeof(TValue) == typeof(ushort))
+            writer.WriteNumberValue((ushort)(object)value.Value);
         else if (typeof(TValue) == typeof(uint))
             writer.WriteNumberValue((uint)(object)value.Value);
         else if (typeof(TValue) == typeof(float))
diff --git a/test/SmartEnum.SystemTextJson.UnitTests/FlagTestEnums.cs b/test/SmartEnum.SystemTextJson.UnitTests/FlagTestEnums.cs
index 07c06fc0..25bafd2b 100644
--- a/test/SmartEnum.SystemTextJson.UnitTests/FlagTestEnums.cs
+++ b/test/SmartEnum.SystemTextJson.UnitTests/FlagTestEnums.cs
@@ -1,5 +1,12 @@
 namespace Ardalis.SmartEnum.SystemTextJson.UnitTests
 {
+    public sealed class FlagTestEnumUnsignedInt16 : SmartFlagEnum<FlagTestEnumUnsignedInt16, ushort>
+    {
+        public static readonly FlagTestEnumUnsignedInt16 Instance = new(nameof(Instance), 12);
+
+        FlagTestEnumUnsignedInt16(string name, ushort value) : base(name, value) { }
+    }
+
     public sealed class FlagTestEnumInt16 : SmartFlagEnum<FlagTestEnumInt16, short>
     {
         public static readonly FlagTestEnumInt16 Instance = new FlagTestEnumInt16(nameof(Instance), 1);
diff --git a/test/SmartEnum.SystemTextJson.UnitTests/SmartFlagEnumValueConverterTests.cs b/test/SmartEnum.SystemTextJson.UnitTests/SmartFlagEnumValueConverterTests.cs
index 8395d0f8..801bc582 100644
--- a/test/SmartEnum.SystemTextJson.UnitTests/SmartFlagEnumValueConverterTests.cs
+++ b/test/SmartEnum.SystemTextJson.UnitTests/SmartFlagEnumValueConverterTests.cs
@@ -1,4 +1,3 @@
-using Ardalis.SmartEnum;
 using FluentAssertions;
 using System;
 using System.Text.Json;
@@ -11,6 +10,9 @@ public class SmartFlagEnumValueConverterTests
     {
         public class TestClass
         {
+            [JsonConverter(typeof(SmartFlagEnumValueConverter<FlagTestEnumUnsignedInt16, ushort>))]
+            public FlagTestEnumUnsignedInt16 UnsignedInt16 { get; set; }
+
             [JsonConverter(typeof(SmartFlagEnumValueConverter<FlagTestEnumInt16, short>))]
             public FlagTestEnumInt16 Int16 { get; set; }
 
@@ -21,8 +23,9 @@ public class TestClass
             public FlagTestEnumDouble Double { get; set; }
         }
 
-        static readonly TestClass TestInstance = new TestClass
+        static readonly TestClass TestInstance = new()
         {
+            UnsignedInt16 = FlagTestEnumUnsignedInt16.Instance,
             Int16 = FlagTestEnumInt16.Instance,
             Int32 = FlagTestEnumInt32.Instance2,
             Double = FlagTestEnumDouble.Instance
@@ -30,6 +33,7 @@ public class TestClass
 
         static readonly string JsonString = JsonSerializer.Serialize(new
         {
+            UnsignedInt16 = 12,
             Int16 = 1,
             Int32 = 2,
             Double = 1