diff --git a/src/Orleans.CodeGenerator/CodeGenerator.cs b/src/Orleans.CodeGenerator/CodeGenerator.cs
index bafcd97fd28..153591b3fa2 100644
--- a/src/Orleans.CodeGenerator/CodeGenerator.cs
+++ b/src/Orleans.CodeGenerator/CodeGenerator.cs
@@ -380,7 +380,7 @@ bool ShouldIncludePrimaryConstructorParameters(INamedTypeSymbol t)
 
             if (namespaces.Count > 0)
             {
-                namespaces[0] = namespaces[0]
+                namespaces[namespaces.Count - 1] = namespaces[namespaces.Count - 1]
                     .WithTrailingTrivia(
                        SyntaxFactory.TriviaList(
                            new List<SyntaxTrivia>