Index: /trunk/include/VBox/vd-ifs.h
===================================================================
--- /trunk/include/VBox/vd-ifs.h	(revision 79793)
+++ /trunk/include/VBox/vd-ifs.h	(revision 79794)
@@ -1153,6 +1153,6 @@
 {
      int rc = 0;
-     char pszValue[11];
-     (void) RTStrPrintf(pszValue, sizeof(pszValue), "%ul", u64Value);
+     char pszValue[21];
+     (void) RTStrPrintf(pszValue, sizeof(pszValue), "%RU64", u64Value);
      rc = VDCFGUpdate(pCfgIf, fCreate, pszName, pszValue);
      return rc;