diff --git a/services/core/jni/com_android_server_UsbDeviceManager.cpp b/services/core/jni/com_android_server_UsbDeviceManager.cpp
index 0393c651a8853..a1bff9d850bf6 100644
--- a/services/core/jni/com_android_server_UsbDeviceManager.cpp
+++ b/services/core/jni/com_android_server_UsbDeviceManager.cpp
@@ -46,7 +46,7 @@ static void set_accessory_string(JNIEnv *env, int fd, int cmd, jobjectArray strA
     char buffer[256];
 
     buffer[0] = 0;
-    int length = ioctl(fd, cmd, buffer);
+    ioctl(fd, cmd, buffer);
     if (buffer[0]) {
         jstring obj = env->NewStringUTF(buffer);
         env->SetObjectArrayElement(strArray, index, obj);