Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp	(revision 27518)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManageModifyVM.cpp	(revision 27519)
@@ -1703,5 +1703,5 @@
                 if (!strcmp(ValueUnion.psz, "buffered"))
                     CHECK_ERROR(machine, COMSETTER(IoBackend)(IoBackendType_Buffered));
-                else if (!strcmp(ValueUnion.psz, "async"))
+                else if (!strcmp(ValueUnion.psz, "unbuffered"))
                     CHECK_ERROR(machine, COMSETTER(IoBackend)(IoBackendType_Unbuffered));
                 else