diff --git a/src/lasp/device/lasp_daq.cpp b/src/lasp/device/lasp_daq.cpp
index c545980..2c39627 100644
--- a/src/lasp/device/lasp_daq.cpp
+++ b/src/lasp/device/lasp_daq.cpp
@@ -44,6 +44,9 @@ Daq::Daq(const DeviceInfo &devinfo, const DaqConfiguration &config)
       throw rte("Duplex mode enabled, but no output channels enabled");
     }
   }
+  if(!duplexMode() && monitorOutput) {
+    throw rte("Output monitoring only allowed when running in duplex mode");
+  }
 
   if (!hasInternalOutputMonitor && monitorOutput) {
     throw rte(