diff --git a/BeefLibs/corlib/src/IO/StringStream.bf b/BeefLibs/corlib/src/IO/StringStream.bf
index 448e7d4f..9dec3d40 100644
--- a/BeefLibs/corlib/src/IO/StringStream.bf
+++ b/BeefLibs/corlib/src/IO/StringStream.bf
@@ -23,6 +23,7 @@ namespace System.IO
 			mString = appendStr;
 		}
 
+		[DisableChecks]
 		public ~this()
 		{
 			if (mStringKind == .Append)
diff --git a/BeefLibs/corlib/src/Internal.bf b/BeefLibs/corlib/src/Internal.bf
index 1deb7126..fd4d1b56 100644
--- a/BeefLibs/corlib/src/Internal.bf
+++ b/BeefLibs/corlib/src/Internal.bf
@@ -437,7 +437,7 @@ namespace System
 #endif
 		}
 
-		public static void Dbg_AppendDeleted(Object rootObj)
+		public static void Dbg_AppendDeleted(Object rootObj, bool doChecks)
 		{
 #if BF_ENABLE_OBJECT_DEBUG_FLAGS
 			void Handle(AppendAllocEntry* headAllocEntry)
@@ -448,11 +448,14 @@ namespace System
 					switch (checkAllocEntry.mKind)
 					{
 					case .Object(let obj):
-#unwarn
-						if (!obj.[DisableObjectAccessChecks]IsDeleted())
+						if (doChecks)
 						{
-							if (obj.GetType().HasDestructor)
-								Debug.FatalError("Appended object not deleted with 'delete:append'");
+#unwarn
+							if (!obj.[DisableObjectAccessChecks]IsDeleted())
+							{
+								if (obj.GetType().HasDestructor)
+									Debug.FatalError("Appended object not deleted with 'delete:append'");
+							}
 						}
 					case .Raw(let rawPtr, let allocData):
 					default:
diff --git a/IDEHelper/Compiler/BfModule.cpp b/IDEHelper/Compiler/BfModule.cpp
index bffd377b..f4c15768 100644
--- a/IDEHelper/Compiler/BfModule.cpp
+++ b/IDEHelper/Compiler/BfModule.cpp
@@ -18142,9 +18142,10 @@ void BfModule::EmitDtorBody()
  	{		
 		auto thisValue = GetThis();
 		auto appendedObj = mBfIRBuilder->CreateBitCast(thisValue.mValue, mBfIRBuilder->MapType(mContext->mBfObjectType));
-		BfModuleMethodInstance allocMethod = GetInternalMethod("Dbg_AppendDeleted", 1);
+		BfModuleMethodInstance allocMethod = GetInternalMethod("Dbg_AppendDeleted", 2);
 		SizedArray<BfIRValue, 1> llvmArgs;
-		llvmArgs.push_back(appendedObj);			
+		llvmArgs.Add(appendedObj);
+		llvmArgs.Add(mBfIRBuilder->CreateConst(BfTypeCode_Boolean, mCurMethodState->mDisableChecks ? 0 : 1));
 		if (allocMethod)
 			mBfIRBuilder->CreateCall(allocMethod.mFunc, llvmArgs);
  	}
@@ -22030,6 +22031,20 @@ void BfModule::ProcessMethod(BfMethodInstance* methodInstance, bool isInlineDup,
 	if ((methodDef != NULL) && (propertyDeclaration != NULL) && (propertyDeclaration->mExternSpecifier != NULL))
 		hasExternSpecifier = true;
 
+	if (methodDef->mName == BF_METHODNAME_MARKMEMBERS)
+	{
+		// We need to be able to mark deleted objects
+		mCurMethodState->mIgnoreObjectAccessCheck = true;
+	}
+	auto customAttributes = methodInstance->GetCustomAttributes();
+	if (customAttributes != NULL)
+	{
+		if (customAttributes->Contains(mCompiler->mDisableObjectAccessChecksAttributeTypeDef))
+			mCurMethodState->mIgnoreObjectAccessCheck = true;
+		if (customAttributes->Contains(mCompiler->mDisableChecksAttributeTypeDef))
+			mCurMethodState->mDisableChecks = true;
+	}
+
 	// Allocate, clear, set classVData
 
 	if ((methodDef->mMethodType == BfMethodType_Ctor) && (methodDef->mIsStatic))
@@ -22207,21 +22222,7 @@ void BfModule::ProcessMethod(BfMethodInstance* methodInstance, bool isInlineDup,
 	if ((!mCurTypeInstance->IsBoxed()) && (methodDeclaration != NULL) && (methodDeclaration->mHadYield) && (methodDef->mBody != NULL))
 	{
 		EmitIteratorBlock(skipBody);
-	}
-
-	if (methodDef->mName == BF_METHODNAME_MARKMEMBERS)
-	{
-		// We need to be able to mark deleted objects
-		mCurMethodState->mIgnoreObjectAccessCheck = true;
-	}
-	auto customAttributes = methodInstance->GetCustomAttributes();
-	if (customAttributes != NULL)
-	{
-		if (customAttributes->Contains(mCompiler->mDisableObjectAccessChecksAttributeTypeDef))
-			mCurMethodState->mIgnoreObjectAccessCheck = true;
-		if (customAttributes->Contains(mCompiler->mDisableChecksAttributeTypeDef))
-			mCurMethodState->mDisableChecks = true;
-	}
+	}	
 
 	if ((methodDef->mMethodType == BfMethodType_CtorNoBody) && (!methodDef->mIsStatic) &&
 		((methodInstance->mChainType == BfMethodChainType_ChainHead) || (methodInstance->mChainType == BfMethodChainType_None)))