diff --git a/services/audiopolicy/enginedefault/src/Engine.cpp b/services/audiopolicy/enginedefault/src/Engine.cpp
index f8ba3f2..f2224fd 100755
--- a/services/audiopolicy/enginedefault/src/Engine.cpp
+++ b/services/audiopolicy/enginedefault/src/Engine.cpp
@@ -231,20 +231,20 @@
 
 audio_devices_t Engine::getDeviceForStrategy(routing_strategy strategy) const
 {
-    const DeviceVector &availableOutputDevices = mApmObserver->getAvailableOutputDevices();
-    const DeviceVector &availableInputDevices = mApmObserver->getAvailableInputDevices();
+    DeviceVector availableOutputDevices = mApmObserver->getAvailableOutputDevices();
+    DeviceVector availableInputDevices = mApmObserver->getAvailableInputDevices();
 
     const SwAudioOutputCollection &outputs = mApmObserver->getOutputs();
 
-    return getDeviceForStrategyInt(strategy, (DeviceVector&)availableOutputDevices,
+    return getDeviceForStrategyInt(strategy, availableOutputDevices,
                                    availableInputDevices, outputs);
 }
 
 
 
 audio_devices_t Engine::getDeviceForStrategyInt(routing_strategy strategy,
-                                                DeviceVector &availableOutputDevices,
-                                                const DeviceVector &availableInputDevices,
+                                                DeviceVector availableOutputDevices,
+                                                DeviceVector availableInputDevices,
                                                 const SwAudioOutputCollection &outputs) const
 {
     uint32_t device = AUDIO_DEVICE_NONE;
diff --git a/services/audiopolicy/enginedefault/src/Engine.h b/services/audiopolicy/enginedefault/src/Engine.h
index ed93d1c..606ad28 100755
--- a/services/audiopolicy/enginedefault/src/Engine.h
+++ b/services/audiopolicy/enginedefault/src/Engine.h
@@ -126,8 +126,8 @@
     routing_strategy getStrategyForUsage(audio_usage_t usage);
     audio_devices_t getDeviceForStrategy(routing_strategy strategy) const;
     audio_devices_t getDeviceForStrategyInt(routing_strategy strategy,
-                                            DeviceVector &availableOutputDevices,
-                                            const DeviceVector &availableInputDevices,
+                                            DeviceVector availableOutputDevices,
+                                            DeviceVector availableInputDevices,
                                             const SwAudioOutputCollection &outputs) const;
     audio_devices_t getDeviceForInputSource(audio_source_t inputSource) const;
     audio_mode_t mPhoneState;  /**< current phone state. */