diff --git a/Software/PC_Application/LibreVNA-GUI/Device/LibreVNA/librevnadriver.cpp b/Software/PC_Application/LibreVNA-GUI/Device/LibreVNA/librevnadriver.cpp
index 64d4a6f..c597eb2 100644
--- a/Software/PC_Application/LibreVNA-GUI/Device/LibreVNA/librevnadriver.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/Device/LibreVNA/librevnadriver.cpp
@@ -643,7 +643,7 @@ void LibreVNADriver::handleReceivedPacket(const Protocol::PacketInfo &packet)
                     QString name = "RawPort"+QString::number(i)+"Stage"+QString::number(map.second);
                     m.measurements[name] = input;
                     name = "RawPort"+QString::number(i)+"Stage"+QString::number(map.second)+"Ref";
-                    m.measurements[name] = res->getValue(map.second, i, true);
+                    m.measurements[name] = res->getValue(map.second, i-1, true);
                 }
             }
         }