diff --git a/ICSharpCode.Decompiler.Tests/TestCases/Pretty/Issue3611.cs b/ICSharpCode.Decompiler.Tests/TestCases/Pretty/Issue3611.cs
index 4803fe8d0..e7b0d1286 100644
--- a/ICSharpCode.Decompiler.Tests/TestCases/Pretty/Issue3611.cs
+++ b/ICSharpCode.Decompiler.Tests/TestCases/Pretty/Issue3611.cs
@@ -12,19 +12,19 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 			public string Value { get; } = value;
 		}
 
-		//private class C5(C5.ValueArray array)
-		//{
-		//	public struct ValueArray
-		//	{
-		//		private bool b;
-		//		public bool[] ToArray()
-		//		{
-		//			return null;
-		//		}
-		//	}
+		private class C5(C5.ValueArray array)
+		{
+			public struct ValueArray
+			{
+				private bool b;
+				public bool[] ToArray()
+				{
+					return null;
+				}
+			}
 
-		//	public bool[] Values = array.ToArray();
-		//}
+			public bool[] Values = array.ToArray();
+		}
 
 		private class BaseClass
 		{
@@ -33,14 +33,15 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 			}
 		}
 
-		//private class C6(C6.Data2 data) : BaseClass(data.Value)
-		//{
-		//	public struct Data2 { 
-		//		public int Value { get; set; }
-		//	}
+		private class C6(C6.Data2 data) : BaseClass(data.Value)
+		{
+			public struct Data2
+			{
+				public int Value { get; set; }
+			}
 
-		//	public Data2 Data => data;
-		//}
+			public Data2 Data => data;
+		}
 
 		private struct S3<T>(T v)
 		{
diff --git a/ICSharpCode.Decompiler/CSharp/Transforms/IntroduceUsingDeclarations.cs b/ICSharpCode.Decompiler/CSharp/Transforms/IntroduceUsingDeclarations.cs
index de33e29fe..a2321bf10 100644
--- a/ICSharpCode.Decompiler/CSharp/Transforms/IntroduceUsingDeclarations.cs
+++ b/ICSharpCode.Decompiler/CSharp/Transforms/IntroduceUsingDeclarations.cs
@@ -189,6 +189,8 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 			CSharpResolver resolver;
 			TypeSystemAstBuilder astBuilder;
 
+			bool inPrimaryConstructor;
+
 			public FullyQualifyAmbiguousTypeNamesVisitor(TransformContext context, UsingScope usingScope)
 			{
 				this.ignoreUsingScope = !context.Settings.UsingDeclarations;
@@ -265,9 +267,19 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 					base.VisitTypeDeclaration(typeDeclaration);
 					return;
 				}
+
+				if (typeDeclaration.HasPrimaryConstructor)
+				{
+					inPrimaryConstructor = true;
+					typeDeclaration.PrimaryConstructorParameters.AcceptVisitor(this);
+					inPrimaryConstructor = false;
+				}
+
 				var previousResolver = resolver;
 				var previousAstBuilder = astBuilder;
+
 				resolver = resolver.WithCurrentTypeDefinition(typeDeclaration.GetSymbol() as ITypeDefinition);
+
 				try
 				{
 					astBuilder = CreateAstBuilder(resolver);
@@ -280,6 +292,12 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 				}
 			}
 
+			public override void VisitParameterDeclaration(ParameterDeclaration parameterDeclaration)
+			{
+				if (inPrimaryConstructor || parameterDeclaration.Parent is not TypeDeclaration)
+					base.VisitParameterDeclaration(parameterDeclaration);
+			}
+
 			public override void VisitMethodDeclaration(MethodDeclaration methodDeclaration)
 			{
 				Visit(methodDeclaration, base.VisitMethodDeclaration);