diff --git a/src/modules/Elsa.Workflows.Core/UIHints/Dropdown/StaticDropDownOptionsProvider.cs b/src/modules/Elsa.Workflows.Core/UIHints/Dropdown/StaticDropDownOptionsProvider.cs
index 08ea528ad9..db5d67f1aa 100644
--- a/src/modules/Elsa.Workflows.Core/UIHints/Dropdown/StaticDropDownOptionsProvider.cs
+++ b/src/modules/Elsa.Workflows.Core/UIHints/Dropdown/StaticDropDownOptionsProvider.cs
@@ -39,7 +39,11 @@ public ValueTask<IDictionary<string, object>> GetUIPropertiesAsync(PropertyInfo
                 }
             }
 
-            var enumValues = Enum.GetValues(wrappedPropertyType).Cast<object>().ToList();
+            var enumValues = Enum.GetValues(wrappedPropertyType)
+                .Cast<Enum>()
+                .GroupBy(Convert.ToInt32)
+                .Select(g => g.First())
+                .ToList();
             var enumSelectListItems = enumValues.Select(x => new SelectListItem(x.ToString()!, x.ToString()!)).ToList();
             if (isNullableEnum)
                 enumSelectListItems.Insert(0, new SelectListItem("-",""));