diff --git a/src/native/managed/cdacreader/src/Legacy/ISOSDacInterface.cs b/src/native/managed/cdacreader/src/Legacy/ISOSDacInterface.cs
index b2495bfb839fc..4ff1d08ede129 100644
--- a/src/native/managed/cdacreader/src/Legacy/ISOSDacInterface.cs
+++ b/src/native/managed/cdacreader/src/Legacy/ISOSDacInterface.cs
@@ -556,19 +556,12 @@ internal unsafe partial interface ISOSDacInterface12
     int GetGlobalAllocationContext(ulong* allocPtr, ulong* allocLimit);
 }
 
-internal struct VISITHEAP
-{
-    public ulong blockData;
-    public nuint blockSize;
-    public Interop.BOOL blockIsCurrentBlock;
-}
-
 [GeneratedComInterface]
 [Guid("3176a8ed-597b-4f54-a71f-83695c6a8c5e")]
 internal unsafe partial interface ISOSDacInterface13
 {
     [PreserveSig]
-    int TraverseLoaderHeap(ulong loaderHeapAddr, /*LoaderHeapKind*/ int kind, VISITHEAP pCallback);
+    int TraverseLoaderHeap(ulong loaderHeapAddr, /*LoaderHeapKind*/ int kind, /*VISITHEAP*/ delegate* unmanaged<ulong, nuint, Interop.BOOL> pCallback);
     [PreserveSig]
     int GetDomainLoaderAllocator(ulong domainAddress, ulong* pLoaderAllocator);
     [PreserveSig]
diff --git a/src/native/managed/cdacreader/src/Legacy/SOSDacImpl.cs b/src/native/managed/cdacreader/src/Legacy/SOSDacImpl.cs
index 7fef6b111de27..75a60ba1b4609 100644
--- a/src/native/managed/cdacreader/src/Legacy/SOSDacImpl.cs
+++ b/src/native/managed/cdacreader/src/Legacy/SOSDacImpl.cs
@@ -1412,7 +1412,7 @@ int ISOSDacInterface12.GetGlobalAllocationContext(ulong* allocPtr, ulong* allocL
     #endregion ISOSDacInterface12
 
     #region ISOSDacInterface13
-    int ISOSDacInterface13.TraverseLoaderHeap(ulong loaderHeapAddr, /*LoaderHeapKind*/ int kind, VISITHEAP pCallback)
+    int ISOSDacInterface13.TraverseLoaderHeap(ulong loaderHeapAddr, /*LoaderHeapKind*/ int kind, /*VISITHEAP*/ delegate* unmanaged<ulong, nuint, Interop.BOOL> pCallback)
         => _legacyImpl13 is not null ? _legacyImpl13.TraverseLoaderHeap(loaderHeapAddr, kind, pCallback) : HResults.E_NOTIMPL;
     int ISOSDacInterface13.GetDomainLoaderAllocator(ulong domainAddress, ulong* pLoaderAllocator)
         => _legacyImpl13 is not null ? _legacyImpl13.GetDomainLoaderAllocator(domainAddress, pLoaderAllocator) : HResults.E_NOTIMPL;