diff --git a/test/unit_tests/sigbuf_15/test.act b/test/unit_tests/sigbuf_15/test.act
index 3bfe367..80862b1 100644
--- a/test/unit_tests/sigbuf_15/test.act
+++ b/test/unit_tests/sigbuf_15/test.act
@@ -39,7 +39,8 @@ import globals;
 open tmpl::dataflow_neuro;
 
 defproc sigbuf_15 (bool? in; bool! out){
-    sigbuf<15> sigbuf_test(.in=in, .out=out);
+    sigbuf<15> sigbuf_test(.in=in);
+    sigbuf_test.out[0] = out;
     sigbuf_test.supply.vss = GND;
     sigbuf_test.supply.vdd = Vdd;