diff --git a/src/musredit_qt6/musrWiz/PAdmin.cpp b/src/musredit_qt6/musrWiz/PAdmin.cpp
index 92d20603..2ccaadd1 100644
--- a/src/musredit_qt6/musrWiz/PAdmin.cpp
+++ b/src/musredit_qt6/musrWiz/PAdmin.cpp
@@ -535,7 +535,7 @@ bool PInstrumentDefXMLParser::startElement()
         return false;
       backward.push_back(ival);
     }
-    detect.setForwards(backward);
+    detect.setBackwards(backward);
     // detector alpha
     str = qAttr.value("alpha").toString();
     dval = str.toDouble(&ok);