diff --git a/icezum/wire/apio.ini b/icezum/wire/apio.ini
new file mode 100644
index 0000000..1c365bf
--- /dev/null
+++ b/icezum/wire/apio.ini
@@ -0,0 +1,4 @@
+[env]
+board = icezum
+top-module = main
+
diff --git a/upduino31/testbench/main_tb.v b/upduino31/testbench/main_tb.v
index f016b6b..980bf3c 100644
--- a/upduino31/testbench/main_tb.v
+++ b/upduino31/testbench/main_tb.v
@@ -65,7 +65,7 @@ module main_tb ();
       .count_en(count_en),
       .digit_1(digit_1),
       .digit_10(digit_10),
-      .carry
+      .carry(carry)
   );
 
   initial begin