diff --git a/sim/dalboard.ts b/sim/dalboard.ts
index 686d1f218..a19c45d7c 100644
--- a/sim/dalboard.ts
+++ b/sim/dalboard.ts
@@ -137,7 +137,7 @@ namespace pxsim {
                 pxsim.CPlayPinName.A7
             ]);
 
-            this.builtinParts["ir"] = this.irState = new InfraredState();
+            this.builtinParts["ir"] = this.irState = new InfraredState(this);
         }
 
         receiveMessage(msg: SimulatorMessage) {
@@ -227,4 +227,4 @@ namespace pxsim {
     if (!pxsim.initCurrentRuntime) {
         pxsim.initCurrentRuntime = initRuntimeWithDalBoard;
     }
-}
\ No newline at end of file
+}