diff --git a/receiver/MockAcquisitionDevice.cpp b/receiver/MockAcquisitionDevice.cpp
index 73139b20..71cd9d5c 100644
--- a/receiver/MockAcquisitionDevice.cpp
+++ b/receiver/MockAcquisitionDevice.cpp
@@ -11,7 +11,7 @@ void MockAcquisitionDevice::Start(const DiffractionExperiment& experiment) {
     cancel = false;
 
     if (experiment.IsUsingInternalPacketGen()) {
-        if (experiment.GetConversionOnFPGA()) {
+        if (experiment.GetConversionOnFPGA() && (experiment.GetDetectorMode() == DetectorMode::Conversion)) {
             for (auto &i: buffer_device)
                 memcpy(i, internal_pkt_gen_frame_conv.data(), RAW_MODULE_SIZE * sizeof(uint16_t));
         } else {