diff --git a/SDL/LSTESData.cc b/SDL/LSTESData.cc
index 5d2237c4..06dd4463 100644
--- a/SDL/LSTESData.cc
+++ b/SDL/LSTESData.cc
@@ -10,75 +10,77 @@
 #include "PixelMap.h"
 #include "ModuleMethods.h"
 
-std::string trackLooperDir() {
-  const char* path_lst_base = std::getenv("LST_BASE");
-  const char* path_tracklooperdir = std::getenv("TRACKLOOPERDIR");
-  std::string path_str;
-  if (path_lst_base != nullptr) {
-    path_str = path_lst_base;
-  } else if (path_tracklooperdir != nullptr) {
-    path_str = path_tracklooperdir;
-  } else {
-    // FIXME: temporary solution, will need to pass a value from FileInPath or CMSSW search path
-    // in the `LSTProducer` or a related ES producer
-    path_str = std::getenv("CMSSW_BASE");
-    path_str += "/src/RecoTracker/LSTCore/TrackLooper";
+namespace {
+  std::string trackLooperDir() {
+    const char* path_lst_base = std::getenv("LST_BASE");
+    const char* path_tracklooperdir = std::getenv("TRACKLOOPERDIR");
+    std::string path_str;
+    if (path_lst_base != nullptr) {
+      path_str = path_lst_base;
+    } else if (path_tracklooperdir != nullptr) {
+      path_str = path_tracklooperdir;
+    } else {
+      // FIXME: temporary solution, will need to pass a value from FileInPath or CMSSW search path
+      // in the `LSTProducer` or a related ES producer
+      path_str = std::getenv("CMSSW_BASE");
+      path_str += "/src/RecoTracker/LSTCore/TrackLooper";
+    }
+    return path_str;
   }
-  return path_str;
-}
 
-std::string get_absolute_path_after_check_file_exists(const std::string name) {
-  std::filesystem::path fullpath = std::filesystem::absolute(name.c_str());
-  if (not std::filesystem::exists(fullpath)) {
-    std::cout << "ERROR: Could not find the file = " << fullpath << std::endl;
-    exit(2);
+  std::string get_absolute_path_after_check_file_exists(const std::string name) {
+    std::filesystem::path fullpath = std::filesystem::absolute(name.c_str());
+    if (not std::filesystem::exists(fullpath)) {
+      std::cout << "ERROR: Could not find the file = " << fullpath << std::endl;
+      exit(2);
+    }
+    return fullpath.string();
   }
-  return fullpath.string();
-}
 
-void loadMapsHost(SDL::MapPLStoLayer& pLStoLayer,
-                  std::shared_ptr<SDL::EndcapGeometryHost<SDL::Dev>> endcapGeometry,
-                  std::shared_ptr<SDL::TiltedGeometry<SDL::Dev>> tiltedGeometry,
-                  std::shared_ptr<SDL::ModuleConnectionMap<SDL::Dev>> moduleConnectionMap) {
-  // Module orientation information (DrDz or phi angles)
-  auto endcap_geom =
-      get_absolute_path_after_check_file_exists(trackLooperDir() + "/data/OT800_IT615_pt0.8/endcap_orientation.bin");
-  auto tilted_geom = get_absolute_path_after_check_file_exists(trackLooperDir() +
-                                                               "/data/OT800_IT615_pt0.8/tilted_barrel_orientation.bin");
-  // Module connection map (for line segment building)
-  auto mappath = get_absolute_path_after_check_file_exists(
-      trackLooperDir() + "/data/OT800_IT615_pt0.8/module_connection_tracing_merged.bin");
+  void loadMapsHost(SDL::MapPLStoLayer& pLStoLayer,
+                    std::shared_ptr<SDL::EndcapGeometryHost<SDL::Dev>> endcapGeometry,
+                    std::shared_ptr<SDL::TiltedGeometry<SDL::Dev>> tiltedGeometry,
+                    std::shared_ptr<SDL::ModuleConnectionMap<SDL::Dev>> moduleConnectionMap) {
+    // Module orientation information (DrDz or phi angles)
+    auto endcap_geom =
+        get_absolute_path_after_check_file_exists(trackLooperDir() + "/data/OT800_IT615_pt0.8/endcap_orientation.bin");
+    auto tilted_geom = get_absolute_path_after_check_file_exists(
+        trackLooperDir() + "/data/OT800_IT615_pt0.8/tilted_barrel_orientation.bin");
+    // Module connection map (for line segment building)
+    auto mappath = get_absolute_path_after_check_file_exists(
+        trackLooperDir() + "/data/OT800_IT615_pt0.8/module_connection_tracing_merged.bin");
 
-  endcapGeometry->load(endcap_geom);
-  tiltedGeometry->load(tilted_geom);
-  moduleConnectionMap->load(mappath);
+    endcapGeometry->load(endcap_geom);
+    tiltedGeometry->load(tilted_geom);
+    moduleConnectionMap->load(mappath);
 
-  auto pLSMapDir = trackLooperDir() + "/data/OT800_IT615_pt0.8/pixelmap/pLS_map";
-  const std::array<std::string, 4> connects{
-      {"_layer1_subdet5", "_layer2_subdet5", "_layer1_subdet4", "_layer2_subdet4"}};
-  std::string path;
+    auto pLSMapDir = trackLooperDir() + "/data/OT800_IT615_pt0.8/pixelmap/pLS_map";
+    const std::array<std::string, 4> connects{
+        {"_layer1_subdet5", "_layer2_subdet5", "_layer1_subdet4", "_layer2_subdet4"}};
+    std::string path;
 
-  static_assert(connects.size() == std::tuple_size<std::decay_t<decltype(pLStoLayer[0])>>{});
-  for (unsigned int i = 0; i < connects.size(); i++) {
-    auto connectData = connects[i].data();
+    static_assert(connects.size() == std::tuple_size<std::decay_t<decltype(pLStoLayer[0])>>{});
+    for (unsigned int i = 0; i < connects.size(); i++) {
+      auto connectData = connects[i].data();
 
-    path = pLSMapDir + connectData + ".bin";
-    pLStoLayer[0][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
+      path = pLSMapDir + connectData + ".bin";
+      pLStoLayer[0][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
 
-    path = pLSMapDir + "_pos" + connectData + ".bin";
-    pLStoLayer[1][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
+      path = pLSMapDir + "_pos" + connectData + ".bin";
+      pLStoLayer[1][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
 
-    path = pLSMapDir + "_neg" + connectData + ".bin";
-    pLStoLayer[2][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
+      path = pLSMapDir + "_neg" + connectData + ".bin";
+      pLStoLayer[2][i] = SDL::ModuleConnectionMap<SDL::Dev>(get_absolute_path_after_check_file_exists(path));
+    }
   }
-}
+}  // namespace
 
 std::unique_ptr<SDL::LSTESHostData<SDL::Dev>> SDL::loadAndFillESHost() {
   auto pLStoLayer = std::make_shared<SDL::MapPLStoLayer>();
   auto endcapGeometry = std::make_shared<SDL::EndcapGeometryHost<SDL::Dev>>();
   auto tiltedGeometry = std::make_shared<SDL::TiltedGeometry<SDL::Dev>>();
   auto moduleConnectionMap = std::make_shared<SDL::ModuleConnectionMap<SDL::Dev>>();
-  loadMapsHost(*pLStoLayer, endcapGeometry, tiltedGeometry, moduleConnectionMap);
+  ::loadMapsHost(*pLStoLayer, endcapGeometry, tiltedGeometry, moduleConnectionMap);
   return std::make_unique<LSTESHostData<SDL::Dev>>(pLStoLayer, endcapGeometry, tiltedGeometry, moduleConnectionMap);
 }
 
@@ -108,4 +110,4 @@ std::unique_ptr<SDL::LSTESDeviceData<SDL::Dev>> SDL::loadAndFillESDevice(SDL::Qu
                            moduleConnectionMap.get());
   return std::make_unique<LSTESDeviceData<SDL::Dev>>(
       nModules, nLowerModules, nPixels, modulesBuffers, endcapGeometry, pixelMapping);
-}
\ No newline at end of file
+}