diff --git a/Grid/lattice/Lattice_slicesum_core.h b/Grid/lattice/Lattice_slicesum_core.h
index f4301c33..e44c581e 100644
--- a/Grid/lattice/Lattice_slicesum_core.h
+++ b/Grid/lattice/Lattice_slicesum_core.h
@@ -119,7 +119,7 @@ template<class vobj> inline void sliceSumReduction_cub_large(const vobj *Data, V
   typedef typename vobj::vector_type vector;
   const int words = sizeof(vobj)/sizeof(vector);
   const int osites = rd*e1*e2;
-  Vector<vector>buffer(osites);
+  commVector<vector>buffer(osites);
   vector *dat = (vector *)Data;
   vector *buf = &buffer[0];
   Vector<vector> lvSum_small(rd);
diff --git a/tests/core/Test_sliceSum.cc b/tests/core/Test_sliceSum.cc
index f86f96f8..5275ddc2 100644
--- a/tests/core/Test_sliceSum.cc
+++ b/tests/core/Test_sliceSum.cc
@@ -105,6 +105,8 @@ int main (int argc, char ** argv) {
 
     int trace_id = traceStart("sliceSum benchmark - ComplexD");
     std::cout << GridLogMessage << "Testing ComplexD" << std::endl;
+    std::cout << GridLogMessage << "sizeof(ComplexD) = " << sizeof(ComplexD) << std::endl;
+    std::cout << GridLogMessage << "sizeof(vComplexD) = " << sizeof(vComplexD) << std::endl;
     for (int i = 0; i < Nd; i++) {
 
       RealD t=-usecond();
@@ -258,4 +260,4 @@ int main (int argc, char ** argv) {
     
     Grid_finalize();
     return 0;
-}
\ No newline at end of file
+}