Index: /trunk/src/VBox/Runtime/tools/RTSignTool.cpp
===================================================================
--- /trunk/src/VBox/Runtime/tools/RTSignTool.cpp	(revision 64951)
+++ /trunk/src/VBox/Runtime/tools/RTSignTool.cpp	(revision 64952)
@@ -820,4 +820,5 @@
                                             if (SignToolPkcs7Exe_CalcPeCheckSum(pThis, hFile, &uCheckSum))
                                             {
+                                                uBuf.NtHdrs32.OptionalHeader.CheckSum = uCheckSum;
                                                 rc = RTFileWriteAt(hFile, offNtHdrs, &uBuf, cbNtHdrs, NULL);
                                                 if (RT_SUCCESS(rc))