diff --git a/running.cap b/captures/running.cap
similarity index 100%
rename from running.cap
rename to captures/running.cap
diff --git a/shutdown.cap b/captures/shutdown.cap
similarity index 100%
rename from shutdown.cap
rename to captures/shutdown.cap
diff --git a/cmd/main.go b/cmd/main.go
index c1ca9fa..53d29fc 100755
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -49,8 +49,8 @@ func main() {
 
 	dc := dcdcusb.DcDcUSB{}
 	if *simulation {
-		if err := sim.SetCaptureFile("dcdcusb.txt"); err != nil {
-			fmt.Printf("Can't open Capture File dcdcusb.txt: %s\n", err)
+		if err := sim.SetCaptureFile("dcdcusb.cap"); err != nil {
+			fmt.Printf("Can't open Capture File dcdcusb.cap: %s\n", err)
 			os.Exit(-1)
 		}
 	}
diff --git a/dcdcusb.go b/dcdcusb.go
index 3c49d53..56a5657 100755
--- a/dcdcusb.go
+++ b/dcdcusb.go
@@ -133,6 +133,7 @@ func (dc *DcDcUSB) Init(log logadapter.Logger, simulation bool) {
 	if !simulation {
 		dc.usbif = realusb.Init(dc.log)
 	} else {
+		sim.SetCaptureFile("dcdcusb.cap")
 		dc.usbif = sim.Init(dc.log)
 	}
 }