diff --git a/Source/IO/NCFile.H b/Source/IO/NCFile.H
index 2fbbb93a..5836cdb3 100644
--- a/Source/IO/NCFile.H
+++ b/Source/IO/NCFile.H
@@ -207,13 +207,13 @@ fill_fab_from_arrays (int iv,
 
     amrex::Box my_box;
 
-    if (var_name == "u" || var_name == "ubar")
+    if (var_name == "u" || var_name == "ubar" || var_name == "mask_u")
     {
         my_box.setSmall(amrex::IntVect(0,-1,0));
         my_box.setBig(amrex::IntVect(nsx-1,nsy-1,nsz-1));
         my_box.setType(amrex::IndexType(amrex::IntVect(1,0,0)));
     }
-    else if (var_name == "v" || var_name == "vbar")
+    else if (var_name == "v" || var_name == "vbar" || var_name == "mask_v")
     {
         my_box.setSmall(amrex::IntVect(-1,0,0));
         my_box.setBig(amrex::IntVect(nsx-1,nsy-1,nsz-1));