diff --git a/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs b/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
index ba99e893d..689e847e6 100644
--- a/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
+++ b/src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs
@@ -105,7 +105,7 @@ public class SetVariable : CodeActivity
         var variable = context.ExpressionExecutionContext.EnumerateVariablesInScope().FirstOrDefault(x => x.Id == variableId);
      
         if (variable == null)
-            throw new($"Variable '{variableId}' not found.");
+            throw new InvalidOperationException($"Variable '{variableId}' not found.");
         
         var value = context.Get(Value);
         variable.Set(context, value);