diff --git a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorDeclSecurity.cs b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorDeclSecurity.cs
index 4b89b8c64a..e2fa15714f 100644
--- a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorDeclSecurity.cs
+++ b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorDeclSecurity.cs
@@ -51,7 +51,7 @@ protected override void InitializeSecurityAttributes() {
 			var data = MDAPI.GetPermissionSetBlob(mdi, token) ?? Array.Empty<byte>();
 			var gpContext = new GenericParamContext();
 			var tmp = DeclSecurityReader.Read(readerModule, data, gpContext);
-			Interlocked.CompareExchange(ref securityAttributes, tmp, null);
+			Interlocked.CompareExchange(ref securityAttributes, tmp, null!);
 		}
 
 		public override byte[] GetBlob() {
diff --git a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorMethodDef.cs b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorMethodDef.cs
index 048b686359..990f76bb18 100644
--- a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorMethodDef.cs
+++ b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorMethodDef.cs
@@ -181,7 +181,7 @@ void InitGenericParams_NoLock() {
 
 		protected override void InitializeOverrides() {
 			var tmp = ownerType.GetMethodOverrides(this);
-			Interlocked.CompareExchange(ref overrides, tmp, null);
+			Interlocked.CompareExchange(ref overrides, tmp, null!);
 		}
 
 		protected override ImplMap? GetImplMap_NoLock() {
diff --git a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorModuleDef.cs b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorModuleDef.cs
index 1068192824..a299d08fcf 100644
--- a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorModuleDef.cs
+++ b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorModuleDef.cs
@@ -943,7 +943,7 @@ CilBody ReadCilBody(IList<Parameter> parameters, uint rva, uint mdToken, Generic
 		protected override void InitializeTypes() {
 			var list = GetNonNestedClassRids();
 			var tmp = new LazyList<TypeDef?, uint[]>(list.Length, this, list, (list2, index) => ResolveTypeDef(list2[index]));
-			Interlocked.CompareExchange(ref types, tmp, null);
+			Interlocked.CompareExchange(ref types, tmp, null!);
 		}
 
 		uint[] GetNonNestedClassRids() {
@@ -1075,7 +1075,7 @@ uint[] GetNewTokens(uint rid) {
 		protected override void InitializeExportedTypes() {
 			var list = MDAPI.GetExportedTypeRids(MetaDataAssemblyImport);
 			var tmp = new LazyList<ExportedType?, uint[]>(list.Length, list, (list2, i) => ResolveExportedType(list2[i]));
-			Interlocked.CompareExchange(ref exportedTypes, tmp, null);
+			Interlocked.CompareExchange(ref exportedTypes, tmp, null!);
 			lastExportedTypeRidInList = list.Length == 0 ? 0 : list.Max();
 		}
 
@@ -1109,7 +1109,7 @@ public bool UpdateExportedTypes() {
 		protected override void InitializeResources() {
 			var list = MDAPI.GetManifestResourceRids(MetaDataAssemblyImport);
 			var tmp = new ResourceCollection(list.Length, null, (ctx, i) => CreateResource((uint)i + 1));
-			Interlocked.CompareExchange(ref resources, tmp, null);
+			Interlocked.CompareExchange(ref resources, tmp, null!);
 			lastManifestResourceRidInList = list.Length == 0 ? 0 : list.Max();
 		}
 
diff --git a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorTypeDef.cs b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorTypeDef.cs
index 64949c1dc5..c15e0e6124 100644
--- a/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorTypeDef.cs
+++ b/Extensions/dnSpy.Debugger/dnSpy.Debugger.DotNet.CorDebug/dndbg/DotNet/CorTypeDef.cs
@@ -409,7 +409,7 @@ void Add(Dictionary<uint, CorMethodDef> dict, IList<MethodDef> methods, uint tok
 		protected override void InitializeNestedTypes() {
 			var list = readerModule.GetTypeDefNestedClassRids(this);
 			var tmp = new LazyList<TypeDef?, uint[]>(list.Length, this, list, (list2, index) => readerModule.ResolveTypeDef(list2[index]));
-			Interlocked.CompareExchange(ref nestedTypes, tmp, null);
+			Interlocked.CompareExchange(ref nestedTypes, tmp, null!);
 		}
 	}
 }