diff --git a/Grid/stencil/SimpleCompressor.h b/Grid/stencil/SimpleCompressor.h
index eda6d9e7..ffbe752c 100644
--- a/Grid/stencil/SimpleCompressor.h
+++ b/Grid/stencil/SimpleCompressor.h
@@ -73,7 +73,7 @@ public:
     auto vp0= &mm.vpointers[0][0];
     auto vp1= &mm.vpointers[1][0];
     auto type= mm.type;
-    accelerator_forNB(o,mm.buffer_size/2,vobj::Nsimd(),{
+    accelerator_forNB(o,mm.buffer_size/2,Merger::Nsimd(),{
 	decompress.Exchange(mp[2*o],mp[2*o+1],vp0[o],vp1[o],type);
     });
   }
diff --git a/Grid/stencil/Stencil.h b/Grid/stencil/Stencil.h
index dd8b646e..1e0b5028 100644
--- a/Grid/stencil/Stencil.h
+++ b/Grid/stencil/Stencil.h
@@ -245,6 +245,7 @@ public:
     Integer rbytes;
   };
   struct Merge {
+    static constexpr int Nsimd = vobj::Nsimd();
     cobj * mpointer;
     Vector<scalar_object *> rpointers;
     Vector<cobj *> vpointers;
@@ -254,6 +255,7 @@ public:
     Coordinate dims;
   };
   struct Decompress {
+    static constexpr int Nsimd = vobj::Nsimd();
     cobj * kernel_p;
     cobj * mpi_p;
     Integer buffer_size;