diff --git a/k4MarlinWrapper/k4MarlinWrapper/converters/EDM4hep2Lcio.h b/k4MarlinWrapper/k4MarlinWrapper/converters/EDM4hep2Lcio.h
index 895551af..8afa8892 100644
--- a/k4MarlinWrapper/k4MarlinWrapper/converters/EDM4hep2Lcio.h
+++ b/k4MarlinWrapper/k4MarlinWrapper/converters/EDM4hep2Lcio.h
@@ -40,6 +40,9 @@
 #include <string>
 #include <vector>
 
+using EDM4hep2LCIOConv::CollectionsPairVectors;
+using EDM4hep2LCIOConv::vec_pair;
+
 class EDM4hep2LcioTool : public GaudiTool, virtual public IEDMConverter {
 public:
   EDM4hep2LcioTool(const std::string& type, const std::string& name, const IInterface* parent);
diff --git a/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp b/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
index 7e5d97f3..783c0593 100644
--- a/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
+++ b/k4MarlinWrapper/src/components/EDM4hep2Lcio.cpp
@@ -25,6 +25,8 @@
 
 DECLARE_COMPONENT(EDM4hep2LcioTool);
 
+using namespace EDM4hep2LCIOConv;
+
 EDM4hep2LcioTool::EDM4hep2LcioTool(const std::string& type, const std::string& name, const IInterface* parent)
     : GaudiTool(type, name, parent), m_eventDataSvc("EventDataSvc", "EDM4hep2LcioTool") {
   declareInterface<IEDMConverter>(this);