diff --git a/src/StronglyTypedIds.Templates/long-full.typedid b/src/StronglyTypedIds.Templates/long-full.typedid
index c63c34af..924b02ce 100644
--- a/src/StronglyTypedIds.Templates/long-full.typedid
+++ b/src/StronglyTypedIds.Templates/long-full.typedid
@@ -88,7 +88,7 @@
         public partial class PLACEHOLDERIDSystemTextJsonConverter : global::System.Text.Json.Serialization.JsonConverter<PLACEHOLDERID>
         {
             public override PLACEHOLDERID Read(ref global::System.Text.Json.Utf8JsonReader reader, global::System.Type typeToConvert, global::System.Text.Json.JsonSerializerOptions options)
-                => new (reader.GetInt32());
+                => new (reader.GetInt64());
 
             public override void Write(global::System.Text.Json.Utf8JsonWriter writer, PLACEHOLDERID value, global::System.Text.Json.JsonSerializerOptions options)
                 => writer.WriteNumberValue(value.Value);
diff --git a/test/StronglyTypedIds.IntegrationTests/LongIdTests.cs b/test/StronglyTypedIds.IntegrationTests/LongIdTests.cs
index 45805b94..6f541b6d 100644
--- a/test/StronglyTypedIds.IntegrationTests/LongIdTests.cs
+++ b/test/StronglyTypedIds.IntegrationTests/LongIdTests.cs
@@ -258,6 +258,18 @@ public void CanDeserializeFromLong_WithSystemTextJsonProvider()
             Assert.Equal(foo, deserializedFoo);
         }
 
+        [Fact]
+        public void CanDeserializeFromLong_MaxLongValue_WithSystemTextJsonProvider()
+        {
+            var value = long.MaxValue;
+            var foo = new ConvertersLongId(value);
+            var serializedLong = SystemTextJsonSerializer.Serialize(value);
+
+            var deserializedFoo = SystemTextJsonSerializer.Deserialize<ConvertersLongId>(serializedLong);
+
+            Assert.Equal(foo, deserializedFoo);
+        }
+
         [Fact]
         public void WhenEfCoreValueConverterUsesValueConverter()
         {