diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 386b6eb..7ad6f9e 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,5 +1,9 @@
 # Release notes
 
+## What's new in 1.6.1 September 4 2022
+### Fixes:
+* Fix wrong generated IL code for copy constructor under .NET5+ target.
+
 ## What's new in 1.6.0 August 31 2020
 ### Fixes:
 * ImmediateType properly handle type having redefined properties with a type different from initial type.
diff --git a/appveyor.yml b/appveyor.yml
index c0d2424..7c0d106 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -186,7 +186,7 @@ deploy:
 # NuGet
   - provider: NuGet
     api_key:
-      secure: zP8NG9npOCKDveAxWgK3a2Nb95gE5tk08i5ksxQKJpzqg0WsbOsK6vfxUjsjmlM+
+      secure: oFnALyCb2Y/Ls9YXoDlQgsLiaHLIVoZmS9d3Ip/+HQy3Z/0AtNl46nfyhvS5CB99
     on:
       configuration: Release
       APPVEYOR_REPO_TAG: true
diff --git a/src/ImmediateReflection/Delegates/DelegatesFactory.cs b/src/ImmediateReflection/Delegates/DelegatesFactory.cs
index 59d0718..9f2b011 100644
--- a/src/ImmediateReflection/Delegates/DelegatesFactory.cs
+++ b/src/ImmediateReflection/Delegates/DelegatesFactory.cs
@@ -146,6 +146,20 @@ private static bool TryGetParamsConstructorAsDefault(
             typeof(object).GetMethod(nameof(GetType))
             ?? throw new InvalidOperationException($"{nameof(GetType)} not found.");
 
+        [NotNull]
+        private static readonly MethodInfo TypeEqualsMethod =
+            typeof(Type).GetMethod(
+                "op_Equality",
+                BindingFlags.Static | BindingFlags.Public,
+                null,
+                new[] { typeof(Type), typeof(Type) },
+                null) ?? throw new InvalidOperationException("Cannot find == operator method on Type.");
+
+        [NotNull]
+        private static readonly MethodInfo GetTypeFromHandleMethod =
+            typeof(Type).GetMethod(nameof(Type.GetTypeFromHandle))
+            ?? throw new InvalidOperationException($"{nameof(Type.GetTypeFromHandle)} not found.");
+
         [Pure]
         [NotNull]
         [ContractAnnotation("type:null => halt")]
@@ -205,7 +219,8 @@ void CheckParameterIsOfRightType()
                 generator.Emit(OpCodes.Ldarg_0);
                 CallMethod(generator, GetTypeMethod);
                 generator.Emit(OpCodes.Ldtoken, type);
-                generator.Emit(OpCodes.Ceq);
+                CallMethod(generator, GetTypeFromHandleMethod);
+                CallMethod(generator, TypeEqualsMethod);
                 generator.Emit(OpCodes.Brtrue_S, paramIsValid);
 
                 // Throw Argument exception => wrong parameter type
diff --git a/src/ImmediateReflection/ImmediateReflection.csproj b/src/ImmediateReflection/ImmediateReflection.csproj
index 23f1418..2bee1fc 100644
--- a/src/ImmediateReflection/ImmediateReflection.csproj
+++ b/src/ImmediateReflection/ImmediateReflection.csproj
@@ -31,15 +31,9 @@ See benchmarks here: https://kernelith.github.io/ImmediateReflection/documentati
 
     <IsPackable>true</IsPackable>
     <PackageId>ImmediateReflection</PackageId>
-    <PackageReleaseNotes>➟ Release 1.6.0
+    <PackageReleaseNotes>➟ Release 1.6.1
 Fixes:
-- ImmediateType properly handle type having redefined properties with a type different from initial type.
-
-New:
-- Use signing key to strong name library assemby.
-
-Misc:
-- JetBrains.Annotations are embedded in the assembly (internal).</PackageReleaseNotes>
+- Fix wrong generated IL code for copy constructor under .NET5+ target.</PackageReleaseNotes>
     <PackageTags>C# Reflection Fast Immediate Performance Delegate Dynamic</PackageTags>
   </PropertyGroup>