diff --git a/src/ReC.Domain/Extensions/ReflectionExtensions.cs b/src/ReC.Domain/Extensions/ReflectionExtensions.cs
index 1eeb191..b3dcd57 100644
--- a/src/ReC.Domain/Extensions/ReflectionExtensions.cs
+++ b/src/ReC.Domain/Extensions/ReflectionExtensions.cs
@@ -9,7 +9,7 @@ public static class ReflectionExtensions
     /// Gets the value of a property by its column name defined in <see cref="ColumnAttribute"/>.
     /// Returns <c>null</c> if no property with the given column name exists.
     /// </summary>
-    public static object? GetValueByColumnName(this object obj, string columnName)
+    public static object? GetValueByColumnName<T>(this T obj, string columnName) where T : class
     {
         var property = obj.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance)
             .FirstOrDefault(p => p.GetCustomAttribute<ColumnAttribute>()?.Name == columnName);