diff --git a/Modules/IO/TestKernel/include/otbTestTools.h b/Modules/IO/TestKernel/include/otbTestTools.h
index 04cfdd93b64af669d130542d90246c23bc2f2edf..22a8cac52169822e9f3356900cb903a90892a332 100644
--- a/Modules/IO/TestKernel/include/otbTestTools.h
+++ b/Modules/IO/TestKernel/include/otbTestTools.h
@@ -29,63 +29,9 @@ namespace otb
 namespace testtools
 {
 
-void PrintMetadataBase(ImageMetadataBase imdb, std::ostream& oss)
-{
-  std::unordered_map<std::string, std::string> kwl;
-  imdb.ToKeywordlist(kwl);
-  for (auto It = otb::MetaData::MDStrNames.left.begin() ; It != otb::MetaData::MDStrNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
-
-  for (auto It = otb::MetaData::MDNumNames.left.begin() ; It != otb::MetaData::MDNumNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
-
-  for (auto It = otb::MetaData::MDTimeNames.left.begin() ; It != otb::MetaData::MDTimeNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
-
-  for (auto It = otb::MetaData::MDGeomNames.left.begin() ; It != otb::MetaData::MDGeomNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
-
-  for (auto It = otb::MetaData::MDL1DNames.left.begin() ; It != otb::MetaData::MDL1DNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
+void PrintMetadataBase(ImageMetadataBase imdb, std::ostream& oss);
 
-  for (auto It = otb::MetaData::MDL2DNames.left.begin() ; It != otb::MetaData::MDL2DNames.left.end() ; ++It)
-  {
-    auto Key = kwl.find(It->second);
-    if (Key != kwl.end())
-      oss << It->second << ' ' << Key->second << '\n';
-  }
-
-  std::string prefix("Extra.");
-  for (const auto& kv : imdb.ExtraKeys)
-    oss << prefix + kv.first << ' ' << kv.second << '\n';
-}
-
-void PrintMetadata(ImageMetadata imd, std::ostream& oss)
-{
-  PrintMetadataBase(imd, oss);
-  for (ImageMetadataBase imdb : imd.Bands)
-    PrintMetadataBase(imdb, oss);
-}
+void PrintMetadata(ImageMetadata imd, std::ostream& oss);
 
 }
 }
diff --git a/Modules/IO/TestKernel/src/CMakeLists.txt b/Modules/IO/TestKernel/src/CMakeLists.txt
index 6030369198d58c7fa16fee317b1cbca4527f2769..45aeafd675615e1516cb6f7ce21b9d10b63cc0bb 100644
--- a/Modules/IO/TestKernel/src/CMakeLists.txt
+++ b/Modules/IO/TestKernel/src/CMakeLists.txt
@@ -18,7 +18,7 @@
 # limitations under the License.
 #
 
-add_library(OTBTestKernel otbTestHelper.cxx)
+add_library(OTBTestKernel otbTestHelper.cxx otbTestTools.cxx)
 target_link_libraries(OTBTestKernel 
   ${OTBGdalAdapters_LIBRARIES}
   ${OTBImageIO_LIBRARIES}
diff --git a/Modules/IO/TestKernel/src/otbTestTools.cxx b/Modules/IO/TestKernel/src/otbTestTools.cxx
new file mode 100644
index 0000000000000000000000000000000000000000..f391f1ce03b903421bee21a3c7082e6892cdb3d9
--- /dev/null
+++ b/Modules/IO/TestKernel/src/otbTestTools.cxx
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
+ *
+ * This file is part of Orfeo Toolbox
+ *
+ *     https://www.orfeo-toolbox.org/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "otbTestTools.h"
+
+namespace otb
+{
+namespace testtools
+{
+
+void PrintMetadataBase(ImageMetadataBase imdb, std::ostream& oss)
+{
+  std::unordered_map<std::string, std::string> kwl;
+  imdb.ToKeywordlist(kwl);
+  for (auto It = otb::MetaData::MDStrNames.left.begin() ; It != otb::MetaData::MDStrNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  for (auto It = otb::MetaData::MDNumNames.left.begin() ; It != otb::MetaData::MDNumNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  for (auto It = otb::MetaData::MDTimeNames.left.begin() ; It != otb::MetaData::MDTimeNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  for (auto It = otb::MetaData::MDGeomNames.left.begin() ; It != otb::MetaData::MDGeomNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  for (auto It = otb::MetaData::MDL1DNames.left.begin() ; It != otb::MetaData::MDL1DNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  for (auto It = otb::MetaData::MDL2DNames.left.begin() ; It != otb::MetaData::MDL2DNames.left.end() ; ++It)
+  {
+    auto Key = kwl.find(It->second);
+    if (Key != kwl.end())
+      oss << It->second << ' ' << Key->second << '\n';
+  }
+
+  std::string prefix("Extra.");
+  for (const auto& kv : imdb.ExtraKeys)
+    oss << prefix + kv.first << ' ' << kv.second << '\n';
+}
+
+void PrintMetadata(ImageMetadata imd, std::ostream& oss)
+{
+  PrintMetadataBase(imd, oss);
+  for (ImageMetadataBase imdb : imd.Bands)
+    PrintMetadataBase(imdb, oss);
+}
+
+}}