diff --git a/DDCore/src/IOV.cpp b/DDCore/src/IOV.cpp
index 0e1e321abf8c58b20cc6888c343ff65ec13bdd06..4949639b08b479222d27a2a6281f44f40e9b8d37 100644
--- a/DDCore/src/IOV.cpp
+++ b/DDCore/src/IOV.cpp
@@ -24,6 +24,11 @@
 using namespace std;
 using namespace dd4hep;
 
+#if __cplusplus == 201402
+const IOV::Key_value_type IOV::MIN_KEY;
+const IOV::Key_value_type IOV::MAX_KEY;
+#endif
+
 #if 0
 /// Assignment operator
 IOVType& IOVType::operator=(const IOVType& copy)  {