diff --git a/docs/src/man/ShearBands.md b/docs/src/man/ShearBands.md
index c90591c6..8a7f7169 100644
--- a/docs/src/man/ShearBands.md
+++ b/docs/src/man/ShearBands.md
@@ -140,8 +140,8 @@ where `(-Inf, Inf)` is the viscosity cutoff.
         free_slip = (left = true, right = true, top = true, bot = true),
         no_slip   = (left = false, right = false, top = false, bot=false),
     )
-    stokes.V.Vx .= PTArray([ x*εbg for x in xvi[1], _ in 1:ny+2])
-    stokes.V.Vy .= PTArray([-y*εbg for _ in 1:nx+2, y in xvi[2]])
+    stokes.V.Vx .= PTArray(backend_JR)([ x*εbg for x in xvi[1], _ in 1:ny+2])
+    stokes.V.Vy .= PTArray(backend_JR)([-y*εbg for _ in 1:nx+2, y in xvi[2]])
     flow_bcs!(stokes, flow_bcs) # apply boundary conditions
     update_halo!(@velocity(stokes)...)