diff --git a/dataflow_neuro/coders.act b/dataflow_neuro/coders.act
index 7b423e7..a54c457 100644
--- a/dataflow_neuro/coders.act
+++ b/dataflow_neuro/coders.act
@@ -453,7 +453,7 @@ namespace tmpl {
 			(i:Nx:x_acks[i] = x[i].a;)
 			dualrail_encoder<NxC, Nx> x_encoder(.in = x_acks, .out = x_enc_out, .supply = supply);
 
-			bool y_acks[Nx];
+			bool y_acks[Ny];
 			Mx1of2<NyC> y_enc_out;
 			(i:Ny:y_acks[i] = y[i].a;)
 			dualrail_encoder<NyC, Ny> y_encoder(.in = y_acks, .out = y_enc_out, .supply = supply);