diff --git a/example/src/main/java/com/felhr/serialportexample/UsbService.java b/example/src/main/java/com/felhr/serialportexample/UsbService.java
index 80cc241..0efac01 100644
--- a/example/src/main/java/com/felhr/serialportexample/UsbService.java
+++ b/example/src/main/java/com/felhr/serialportexample/UsbService.java
@@ -158,6 +158,7 @@ public class UsbService extends Service {
     @Override
     public void onDestroy() {
         super.onDestroy();
+        serialPort.close();
         unregisterReceiver(usbReceiver);
         UsbService.SERVICE_CONNECTED = false;
     }
diff --git a/examplestreams/src/main/java/com/felhr/examplestreams/UsbService.java b/examplestreams/src/main/java/com/felhr/examplestreams/UsbService.java
index 7460066..f53ec19 100644
--- a/examplestreams/src/main/java/com/felhr/examplestreams/UsbService.java
+++ b/examplestreams/src/main/java/com/felhr/examplestreams/UsbService.java
@@ -129,6 +129,7 @@ public class UsbService extends Service {
     @Override
     public void onDestroy() {
         super.onDestroy();
+        serialPort.close();
         unregisterReceiver(usbReceiver);
         UsbService.SERVICE_CONNECTED = false;
     }
diff --git a/examplesync/src/main/java/com/felhr/serialportexamplesync/UsbService.java b/examplesync/src/main/java/com/felhr/serialportexamplesync/UsbService.java
index 5ea9811..2bccdcf 100644
--- a/examplesync/src/main/java/com/felhr/serialportexamplesync/UsbService.java
+++ b/examplesync/src/main/java/com/felhr/serialportexamplesync/UsbService.java
@@ -159,6 +159,7 @@ public class UsbService extends Service {
     @Override
     public void onDestroy() {
         super.onDestroy();
+        serialPort.close();
         unregisterReceiver(usbReceiver);
         UsbService.SERVICE_CONNECTED = false;
     }