Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp	(revision 22733)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp	(revision 22734)
@@ -301,6 +301,6 @@
     {
         pszValue = a->argv[2];
-        if (   !strcmp(a->argv[3], "--flags")
-            && !strcmp(a->argv[3], "-flags"))
+        if (   strcmp(a->argv[3], "--flags")
+            && strcmp(a->argv[3], "-flags"))
             usageOK = false;
         pszFlags = a->argv[4];