diff --git a/virtualization/api/hypervisor-platform/samples/WinHvSampleAmd64.cpp b/virtualization/api/hypervisor-platform/samples/WinHvSampleAmd64.cpp
index 13a181ca7..a7d070a3d 100644
--- a/virtualization/api/hypervisor-platform/samples/WinHvSampleAmd64.cpp
+++ b/virtualization/api/hypervisor-platform/samples/WinHvSampleAmd64.cpp
@@ -204,7 +204,7 @@ void LongMode(void)
     const UINT64 gdtNullEntryIndex = 0;
     // GDT CS entry - page granularity, long, present, type code, execute\read\accessed
     const UINT16 csAttributes = 0xa09b;
-    const UINT64 gdtCsEntryValue = ((UINT64)csAttributes << 20);
+    const UINT64 gdtCsEntryValue = ((UINT64)csAttributes << 40);
     const UINT64 gdtCsEntryIndex = 1;
 
     uint64_t *gdtPage = static_cast<uint64_t *>(addressSpace.CommitRange(gdtSize, PAGE_READWRITE));