diff --git a/modules/rostests/kmtests/ntos_cc/CcMapData_drv.c b/modules/rostests/kmtests/ntos_cc/CcMapData_drv.c
index 6535f7f3264..8fd6f6bd898 100644
--- a/modules/rostests/kmtests/ntos_cc/CcMapData_drv.c
+++ b/modules/rostests/kmtests/ntos_cc/CcMapData_drv.c
@@ -100,9 +100,9 @@ static CACHE_MANAGER_CALLBACKS Callbacks = {
 };
 
 static CC_FILE_SIZES FileSizes = {
-    .AllocationSize.QuadPart = 0x4000,
-    .FileSize.QuadPart = 0x4000,
-    .ValidDataLength.QuadPart = 0x4000,
+    RTL_CONSTANT_LARGE_INTEGER((LONGLONG)0x4000), // .AllocationSize
+    RTL_CONSTANT_LARGE_INTEGER((LONGLONG)0x4000), // .FileSize
+    RTL_CONSTANT_LARGE_INTEGER((LONGLONG)0x4000)  // .ValidDataLength
 };
 
 static