diff --git a/slsDetectorSoftware/src/CmdProxy.cpp b/slsDetectorSoftware/src/CmdProxy.cpp
index 968550d39..f6a1aeb0e 100644
--- a/slsDetectorSoftware/src/CmdProxy.cpp
+++ b/slsDetectorSoftware/src/CmdProxy.cpp
@@ -2593,9 +2593,9 @@ std::string CmdProxy::AdcVpp(int action) {
         } else if (args.size() > 2 || args.size() < 1) {
             WrongNumberOfParameters(1);
         }
-        det->setADCVpp(StringTo<int>(args[1]), mV,
+        det->setADCVpp(StringTo<int>(args[0]), mV,
                     std::vector<int>{det_id});
-        os << args[1] << (mV ? " mV\n" : "\n");
+        os << args[0] << (mV ? " mV\n" : "\n");
     } else {
         throw RuntimeError("Unknown action");
     }