diff --git a/DDCore/src/GrammarTypes.cpp b/DDCore/src/GrammarTypes.cpp
index eee5971c8ed90a7f87fc8b971b41ca769aa590bf..0a7136e49fde54da9f5e0a19205a7972be5c06f1 100644
--- a/DDCore/src/GrammarTypes.cpp
+++ b/DDCore/src/GrammarTypes.cpp
@@ -26,7 +26,9 @@
 #include <Math/Vector3D.h>
 
 namespace ROOT {
+
   namespace Math {
+
     /// Allow point insertion of a point in maps
     bool operator<(const XYZPoint& a, const XYZPoint& b);
     /// Allow 3-vector insertion of a  in maps
@@ -35,6 +37,7 @@ namespace ROOT {
     bool operator<(const PxPyPzEVector& a, const PxPyPzEVector& b);
   }
 }
+
 DD4HEP_DEFINE_PARSER_GRAMMAR_ROOTMATH(ROOT::Math::XYZPoint,eval_obj)
 DD4HEP_DEFINE_PARSER_GRAMMAR_ROOTMATH(ROOT::Math::XYZVector,eval_obj)
 DD4HEP_DEFINE_PARSER_GRAMMAR_ROOTMATH(ROOT::Math::PxPyPzEVector,eval_obj)