Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp	(revision 31019)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestProp.cpp	(revision 31020)
@@ -153,5 +153,5 @@
     {
         /* open a session for the VM - new or existing */
-        CHECK_ERROR_RET(machine, LockMachine(a->session, LockType_Write), 1);
+        CHECK_ERROR_RET(machine, LockMachine(a->session, LockType_Shared), 1);
 
         /* get the mutable session machine */