diff --git a/Source/driver/Castro.cpp b/Source/driver/Castro.cpp
index 8f7090a024..c499274250 100644
--- a/Source/driver/Castro.cpp
+++ b/Source/driver/Castro.cpp
@@ -2885,9 +2885,19 @@ Castro::reflux (int crse_level, int fine_level, bool in_post_timestep)
             reg = &getLevel(lev).pres_reg;
 
             MultiFab rdtheta(crse_lev.grids, crse_lev.dmap, 1, 0);
-            rdtheta.setVal(crse_lev.geom.CellSize(1));
 
-            // Need to multiply by r for rdtheta
+            auto problo = Geom().ProbLo();
+            auto dr = crse_lev.geom.CellSize(0);
+            auto dtheta = crse_lev.geom.CellSize(1);
+
+            auto const& ma = rdtheta.arrays();
+
+            amrex:ParallelFor(rdtheta,
+            [=] AMREX_GPU_DEVICE (int b, int i, int j, int k) noexcept
+            {
+                Real r = problo[0] + static_cast<Real>(i + 0.5_rt) * dr;
+                ma[b](i,j,k) = r * dtheta;
+            });
 
             reg->ClearInternalBorders(crse_lev.geom);