diff --git a/src/QMCWaveFunctions/SPOSetT.h b/src/QMCWaveFunctions/SPOSetT.h
index 3d81bc256f..1959422ca7 100644
--- a/src/QMCWaveFunctions/SPOSetT.h
+++ b/src/QMCWaveFunctions/SPOSetT.h
@@ -53,6 +53,7 @@ class SPOSetT : public QMCTraits
   using ValueMatrix       = typename OrbitalSetTraits<T>::ValueMatrix;
   using GradVector        = typename OrbitalSetTraits<T>::GradVector;
   using GradMatrix        = typename OrbitalSetTraits<T>::GradMatrix;
+  using GradType          = TinyVector<T, DIM>;
   using HessVector        = typename OrbitalSetTraits<T>::HessVector;
   using HessMatrix        = typename OrbitalSetTraits<T>::HessMatrix;
   using GGGVector         = typename OrbitalSetTraits<T>::GradHessVector;