diff --git a/test/unit_tests/fifo-decoder_hs-neurons-encoder-fifo/test.act b/test/unit_tests/fifo-decoder_hs-neurons-encoder-fifo/test.act
index a9ddc76..4e2762f 100644
--- a/test/unit_tests/fifo-decoder_hs-neurons-encoder-fifo/test.act
+++ b/test/unit_tests/fifo-decoder_hs-neurons-encoder-fifo/test.act
@@ -55,13 +55,14 @@ defproc fifo_decoder_neurons_encoder_fifo (avMx1of2<7> in; avMx1of2<7> out){
     decoder_2d_hs<NxC,NyC,Nx,Ny> decoder(.in = fifo_pre.out, .reset_B = _reset_B, .supply = supply);
     // Pretend that each "synapse" immediately makes its one neuron "spike".
     // that is, connect the output of each encoder target to the decoder input.
-    nrn_hs_2D_array<Nx,Ny,10> neuron_grid(.reset_B = _reset_B, .supply = supply);
+    nrn_hs_2d_array<Nx,Ny> neuron_grid(.reset_B = _reset_B, .supply = supply);
     (i:Nx*Ny:
         neuron_grid.in[i].r = decoder.out[i].r;
         neuron_grid.in[i].a = decoder.out[i].a;
     )
 
-    encoder2D<NxC,NyC,Nx,Ny,4> encoder(.inx = neuron_grid.outx, .iny = neuron_grid.outy,
+    encoder2d_simple<NxC,NyC,Nx,Ny,4> encoder(.inx = neuron_grid.outx, .iny = neuron_grid.outy,
+        .to_pd_x = neuron_grid.to_pd_x, .to_pd_y = neuron_grid.to_pd_y,
         .reset_B = _reset_B, .supply = supply);
     fifo<NxC + NyC,5> fifo_post(.in = encoder.out, .out = out, .reset_B = _reset_B, .supply = supply);