diff --git a/src/arch/isa_parser.py b/src/arch/isa_parser.py
index ac639b4130..4c3902fc92 100755
--- a/src/arch/isa_parser.py
+++ b/src/arch/isa_parser.py
@@ -802,7 +802,7 @@ class VecRegOperand(Operand):
 
         wb = '''
         if (traceData) {
-            panic("Vectors not supported yet in tracedata");
+            warn_once("Vectors not supported yet in tracedata");
             /*traceData->setData(final_val);*/
         }
         '''