Index: /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp
===================================================================
--- /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp	(revision 76916)
+++ /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp	(revision 76917)
@@ -2137,5 +2137,5 @@
                                          enmState == kMMap_ReadOnly    ? PAGE_READONLY
                                          : enmState == kMMap_WriteCopy ? PAGE_WRITECOPY : PAGE_READWRITE,
-                                         (uint32_t)(cbMapping >> 32), (uint32_t)cbMapping, NULL);
+                                         (uint32_t)((uint64_t)cbMapping >> 32), (uint32_t)cbMapping, NULL);
             DWORD dwErr1 = GetLastError();
             DWORD dwErr2 = 0;