Index: /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 41837)
+++ /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 41838)
@@ -4864,5 +4864,5 @@
     if (   (fAccess & (IEM_ACCESS_WHAT_MASK | IEM_ACCESS_TYPE_WRITE)) == (IEM_ACCESS_WHAT_STACK | IEM_ACCESS_TYPE_WRITE)
         || (fAccess & (IEM_ACCESS_WHAT_MASK | IEM_ACCESS_TYPE_WRITE)) == (IEM_ACCESS_WHAT_DATA | IEM_ACCESS_TYPE_WRITE) )
-        pIemCpu->cbWritten += cbMem;
+        pIemCpu->cbWritten += (uint32_t)cbMem;
     *ppvMem = pvMem;
     return VINF_SUCCESS;