diff --git a/bochs/cpu/proc_ctrl.cc b/bochs/cpu/proc_ctrl.cc
index 4f6a42151..8887ab64b 100644
--- a/bochs/cpu/proc_ctrl.cc
+++ b/bochs/cpu/proc_ctrl.cc
@@ -1131,7 +1131,8 @@ BX_CPU_C::RSM(BxInstruction_t *i)
 BX_CPU_C::RDTSC(BxInstruction_t *i)
 {
 #if BX_CPU_LEVEL >= 5
-  BX_PANIC(("RDTSC: not implemented yet\n"));
+  BX_ERROR(("RDTSC: not implemented yet\n"));
+  UndefinedOpcode(i);
 #else
   UndefinedOpcode(i);
 #endif