diff --git a/contrib/measurement/hdf5/src/reader.cpp b/contrib/measurement/hdf5/src/reader.cpp
index c2f42a32f8..320e7308f9 100644
--- a/contrib/measurement/hdf5/src/reader.cpp
+++ b/contrib/measurement/hdf5/src/reader.cpp
@@ -2,6 +2,7 @@
 #include <ecalhdf5/eh5_meas.h>
 
 using namespace eCAL::experimental::measurement::hdf5;
+using namespace eCAL::experimental::measurement;
 
 Reader::Reader() 
   : measurement(std::make_unique<eh5::HDF5Meas>()) 
diff --git a/contrib/measurement/hdf5/src/writer.cpp b/contrib/measurement/hdf5/src/writer.cpp
index 40a8d2d807..e8cd2a1c38 100644
--- a/contrib/measurement/hdf5/src/writer.cpp
+++ b/contrib/measurement/hdf5/src/writer.cpp
@@ -2,6 +2,7 @@
 #include <ecalhdf5/eh5_meas.h>
 
 using namespace eCAL::experimental::measurement::hdf5;
+using namespace eCAL::experimental::measurement;
 
 Writer::Writer() 
   : measurement(std::make_unique<eh5::HDF5Meas>())