diff --git a/DataFormats/Math/src/classes_def.xml b/DataFormats/Math/src/classes_def.xml
index 73c7811662edf..63bd1884ecf77 100755
--- a/DataFormats/Math/src/classes_def.xml
+++ b/DataFormats/Math/src/classes_def.xml
@@ -5,7 +5,6 @@
   <class pattern="ROOT::Math::PxPyPzE4D<*>" />
   <class pattern="ROOT::Math::Cartesian3D<*>" />
   <class pattern="ROOT::Math::CylindricalEta3D<*>" />
-  <class pattern="ROOT::Math::Polar3D<*>" />
   <class pattern="ROOT::Math::LorentzVector<*>" />
   <class pattern="ROOT::Math::DisplacementVector3D<*>" />
   <class pattern="ROOT::Math::PositionVector3D<*>" />