Index: /trunk/src/VBox/Debugger/DBGCCommands.cpp
===================================================================
--- /trunk/src/VBox/Debugger/DBGCCommands.cpp	(revision 51956)
+++ /trunk/src/VBox/Debugger/DBGCCommands.cpp	(revision 51957)
@@ -1024,5 +1024,5 @@
         if (paArgs[0].u.u64Number >= cCpus)
             rc = DBGCCmdHlpPrintf(pCmdHlp, "error: idCpu %u is out of range! Highest ID is %u.\n",
-                                    paArgs[0].u.u64Number, cCpus);
+                                    paArgs[0].u.u64Number, cCpus-1);
         else
         {