diff --git a/slsDetectorSoftware/src/Module.cpp b/slsDetectorSoftware/src/Module.cpp
index c491a49a7..8918eb2e2 100644
--- a/slsDetectorSoftware/src/Module.cpp
+++ b/slsDetectorSoftware/src/Module.cpp
@@ -1389,8 +1389,8 @@ void Module::setInjectChannel(const int offsetChannel,
     sendToDetector(F_SET_INJECT_CHANNEL, args, nullptr);
 }
 
-void Module::sendVetoPhoton(const int chipIndex, std::vector<int> gainIndices,
-                            std::vector<int> values) {
+void Module::sendVetoPhoton(const int chipIndex, const std::vector<int>& gainIndices,
+                            const std::vector<int>& values) {
     const int nch = gainIndices.size();
     if (gainIndices.size() != values.size()) {
         throw RuntimeError("Number of Gain Indices and values do not match! "
@@ -1406,6 +1406,8 @@ void Module::sendVetoPhoton(const int chipIndex, std::vector<int> gainIndices,
     auto client = DetectorSocket(shm()->hostname, shm()->controlPort);
     client.Send(&fnum, sizeof(fnum));
     client.Send(args, sizeof(args));
+    client.Send(gainIndices.data(), sizeof(decltype(gainIndices[0])) * nch);
+    client.Send(values.data(), sizeof(decltype(values[0])) * nch);
     client.Send(gainIndices.data(), sizeof(int) * nch);
     client.Send(values.data(), sizeof(int) * nch);
     client.Receive(&ret, sizeof(ret));
diff --git a/slsDetectorSoftware/src/Module.h b/slsDetectorSoftware/src/Module.h
index 509af81ea..fecb590cd 100644
--- a/slsDetectorSoftware/src/Module.h
+++ b/slsDetectorSoftware/src/Module.h
@@ -371,8 +371,8 @@ class Module : public virtual slsDetectorDefs {
     void setBurstPeriod(int64_t value);
     std::array<int, 2> getInjectChannel() const;
     void setInjectChannel(const int offsetChannel, const int incrementChannel);
-    void sendVetoPhoton(const int chipIndex, std::vector<int> gainIndices,
-                        std::vector<int> values);
+    void sendVetoPhoton(const int chipIndex, const std::vector<int>& gainIndices,
+                        const std::vector<int>& values);
     void getVetoPhoton(const int chipIndex, const std::string &fname) const;
     void setVetoPhoton(const int chipIndex, const int numPhotons,
                        const int energy, const std::string &fname);