diff --git a/Plugins/DD4hep/include/ACTFW/Plugins/DD4hep/GeometryService.hpp b/Plugins/DD4hep/include/ACTFW/Plugins/DD4hep/GeometryService.hpp
index d77d3173fbf4f1505465d5830a09fb7ab4319883..8c9784b3fd2a5c954e00c1cf9712d3d3b2090881 100644
--- a/Plugins/DD4hep/include/ACTFW/Plugins/DD4hep/GeometryService.hpp
+++ b/Plugins/DD4hep/include/ACTFW/Plugins/DD4hep/GeometryService.hpp
@@ -45,7 +45,7 @@ namespace DD4hep {
       /// The default logger
       std::shared_ptr<const Acts::Logger> logger;
       /// XML-file with the detector description
-      std::string xmlFileName;
+      std::vector<std::string> xmlFileNames;
       /// Logger for the geometry transformation
       Acts::Logging::Level lvl;
       /// The name of the service
@@ -91,7 +91,7 @@ namespace DD4hep {
       Config(const std::string&   lname = "GeometryService",
              Acts::Logging::Level level = Acts::Logging::INFO)
         : logger(Acts::getDefaultLogger(lname, level))
-        , xmlFileName("")
+        , xmlFileNames()
         , lvl(level)
         , name(lname)
         , bTypePhi(Acts::equidistant)
diff --git a/Plugins/DD4hep/src/GeometryService.cpp b/Plugins/DD4hep/src/GeometryService.cpp
index 8302cc1494e7c5db2981585b5bdd408e37ca9502..3d74c901e86cf2c8afd703cbbe13f1b5bc9a6e6b 100644
--- a/Plugins/DD4hep/src/GeometryService.cpp
+++ b/Plugins/DD4hep/src/GeometryService.cpp
@@ -36,13 +36,14 @@ FW::DD4hep::GeometryService::name() const
 FW::ProcessCode
 FW::DD4hep::GeometryService::buildDD4hepGeometry()
 {
-  if (!m_cfg.xmlFileName.empty()) {
-    m_lcdd = &(dd4hep::Detector::getInstance());
-    m_lcdd->fromCompact(m_cfg.xmlFileName.c_str());
-    m_lcdd->volumeManager();
-    m_lcdd->apply("DD4hepVolumeManager", 0, 0);
-    m_dd4hepGeometry = m_lcdd->world();
+  m_lcdd = &(dd4hep::Detector::getInstance());
+  for (auto& file : m_cfg.xmlFileNames) {
+    m_lcdd->fromCompact(file.c_str());
   }
+  m_lcdd->volumeManager();
+  m_lcdd->apply("DD4hepVolumeManager", 0, 0);
+  m_dd4hepGeometry = m_lcdd->world();
+
   return FW::ProcessCode::SUCCESS;
 }