diff --git a/Grid/qcd/representations/two_index.h b/Grid/qcd/representations/two_index.h
index 9a06dc6f..24d6d7cb 100644
--- a/Grid/qcd/representations/two_index.h
+++ b/Grid/qcd/representations/two_index.h
@@ -20,7 +20,7 @@ NAMESPACE_BEGIN(Grid);
  * in the SUnTwoIndex.h file
  */
 
-template <int ncolour, TwoIndexSymmetry S, class group_name>
+template <int ncolour, TwoIndexSymmetry S, class group_name = GroupName::SU>
 class TwoIndexRep {
 public:
   // typdef to be used by the Representations class in HMC to get the
diff --git a/Grid/qcd/utils/GaugeGroup.h b/Grid/qcd/utils/GaugeGroup.h
index 825881e2..a57ace90 100644
--- a/Grid/qcd/utils/GaugeGroup.h
+++ b/Grid/qcd/utils/GaugeGroup.h
@@ -85,7 +85,7 @@ constexpr int compute_adjoint_dimension<GroupName::Sp>(int ncolour) {
   return ncolour / 2 * (ncolour + 1);
 }
 
-template <int ncolour, class group_name>
+template <int ncolour, class group_name = GroupName::SU>
 class GaugeGroup {
  public:
   static const int Dimension = ncolour;
diff --git a/tests/core/Test_lie_generators.cc b/tests/core/Test_lie_generators.cc
index d90e3e47..c4a88356 100644
--- a/tests/core/Test_lie_generators.cc
+++ b/tests/core/Test_lie_generators.cc
@@ -307,7 +307,7 @@ int main(int argc, char** argv) {
   std::cout << GridLogMessage << "Two index Symmetric: Checking Group Structure"
       << std::endl;
   // Testing HMC representation classes
-  TwoIndexRep< Nc, Symmetric, GroupName::SU > TIndexRep(grid);
+  TwoIndexRep< Nc, Symmetric> TIndexRep(grid);
 
   // Test group structure
   // (U_f * V_f)_r = U_r * V_r