diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index b617eb33a..4667a9c40 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -1787,7 +1787,7 @@ class Detector {
     void updateFirmwareAndServer(const std::string &sname,
                                  const std::string &fname, Positions pos = {});
 
-    Result<bool> getUpdateMode(Positions pos = {});
+    Result<bool> getUpdateMode(Positions pos = {}) const;
 
     /** Restarts detector server in update mode. This is useful when
      * server-firmware compatibility is at its worst and server cannot start up
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index 3ad9108cb..3a4c6d42e 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -2195,7 +2195,7 @@ void Detector::updateFirmwareAndServer(const std::string &sname,
     programFPGA(fname, pos);
 }
 
-Result<bool> Detector::getUpdateMode(Positions pos) {
+Result<bool> Detector::getUpdateMode(Positions pos) const {
     return pimpl->Parallel(&Module::getUpdateMode, pos);
 }
 
diff --git a/slsDetectorSoftware/src/Module.cpp b/slsDetectorSoftware/src/Module.cpp
index ce287feaf..1f357e5de 100644
--- a/slsDetectorSoftware/src/Module.cpp
+++ b/slsDetectorSoftware/src/Module.cpp
@@ -2568,7 +2568,9 @@ void Module::rebootController() {
                  << "): Controller rebooted successfully!";
 }
 
-bool Module::getUpdateMode() { return sendToDetector<int>(F_GET_UPDATE_MODE); }
+bool Module::getUpdateMode() const {
+    return sendToDetector<int>(F_GET_UPDATE_MODE);
+}
 
 void Module::setUpdateMode(const bool updatemode) {
     sendToDetector(F_SET_UPDATE_MODE, static_cast<int>(updatemode), nullptr);
diff --git a/slsDetectorSoftware/src/Module.h b/slsDetectorSoftware/src/Module.h
index a11de9065..ed553378d 100644
--- a/slsDetectorSoftware/src/Module.h
+++ b/slsDetectorSoftware/src/Module.h
@@ -545,7 +545,7 @@ class Module : public virtual slsDetectorDefs {
                               const std::string &serverName);
     void updateKernel(std::vector<char> buffer);
     void rebootController();
-    bool getUpdateMode();
+    bool getUpdateMode() const;
     void setUpdateMode(const bool updatemode);
     uint32_t readRegister(uint32_t addr) const;
     uint32_t writeRegister(uint32_t addr, uint32_t val);