diff --git a/src/coreclr/vm/codeman.cpp b/src/coreclr/vm/codeman.cpp
index d019affc33b33..0314a2920f074 100644
--- a/src/coreclr/vm/codeman.cpp
+++ b/src/coreclr/vm/codeman.cpp
@@ -2376,6 +2376,16 @@ HeapList* LoaderCodeHeap::CreateCodeHeap(CodeHeapRequestInfo *pInfo, LoaderHeap
     }
     else
     {
+        // Include internal CodeHeap structures in the reserve
+        allocationSize = ALIGN_UP(allocationSize, VIRTUAL_ALLOC_RESERVE_GRANULARITY);
+        reserveSize = max(reserveSize, allocationSize);
+
+        if (reserveSize != (DWORD) reserveSize)
+        {
+            _ASSERTE(!"reserveSize does not fit in a DWORD");
+            EEPOLICY_HANDLE_FATAL_ERROR(COR_E_EXECUTIONENGINE);
+        }
+
         if (loAddr != NULL || hiAddr != NULL)
         {
 #ifdef _DEBUG