diff --git a/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs b/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
index b9a04daee..6944584b2 100644
--- a/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
+++ b/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
@@ -202,10 +202,10 @@ public class WorkflowManagementFeature : FeatureBase
 
         Services.Configure<ManagementOptions>(options =>
         {
-            foreach (var activityType in ActivityTypes)
+            foreach (var activityType in ActivityTypes.Distinct())
                 options.ActivityTypes.Add(activityType);
 
-            foreach (var descriptor in VariableDescriptors) 
+            foreach (var descriptor in VariableDescriptors.DistinctBy(x => x.Type)) 
                 options.VariableDescriptors.Add(descriptor);
             
             options.CompressionAlgorithm = CompressionAlgorithm;