diff --git a/services/inputflinger/tests/FakeInputReaderPolicy.cpp b/services/inputflinger/tests/FakeInputReaderPolicy.cpp
index 78420c0..41c98ef 100644
--- a/services/inputflinger/tests/FakeInputReaderPolicy.cpp
+++ b/services/inputflinger/tests/FakeInputReaderPolicy.cpp
@@ -158,7 +158,8 @@
     return mConfig;
 }
 
-const std::vector<InputDeviceInfo>& FakeInputReaderPolicy::getInputDevices() const {
+const std::vector<InputDeviceInfo> FakeInputReaderPolicy::getInputDevices() const {
+    std::scoped_lock lock(mLock);
     return mInputDevices;
 }
 
@@ -228,7 +229,7 @@
 
 void FakeInputReaderPolicy::notifyInputDevicesChanged(
         const std::vector<InputDeviceInfo>& inputDevices) {
-    std::scoped_lock<std::mutex> lock(mLock);
+    std::scoped_lock lock(mLock);
     mInputDevices = inputDevices;
     mInputDevicesChanged = true;
     mDevicesChangedCondition.notify_all();
@@ -256,7 +257,7 @@
 }
 
 void FakeInputReaderPolicy::notifyStylusGestureStarted(int32_t deviceId, nsecs_t eventTime) {
-    std::scoped_lock<std::mutex> lock(mLock);
+    std::scoped_lock lock(mLock);
     mStylusGestureNotified = deviceId;
 }
 
diff --git a/services/inputflinger/tests/FakeInputReaderPolicy.h b/services/inputflinger/tests/FakeInputReaderPolicy.h
index e03d28d..48912a6 100644
--- a/services/inputflinger/tests/FakeInputReaderPolicy.h
+++ b/services/inputflinger/tests/FakeInputReaderPolicy.h
@@ -64,7 +64,7 @@
     void removeDisabledDevice(int32_t deviceId);
     void setPointerController(std::shared_ptr<FakePointerController> controller);
     const InputReaderConfiguration& getReaderConfiguration() const;
-    const std::vector<InputDeviceInfo>& getInputDevices() const;
+    const std::vector<InputDeviceInfo> getInputDevices() const;
     TouchAffineTransformation getTouchAffineTransformation(const std::string& inputDeviceDescriptor,
                                                            ui::Rotation surfaceRotation);
     void setTouchAffineTransformation(const TouchAffineTransformation t);
@@ -91,7 +91,7 @@
     void waitForInputDevices(std::function<void(bool)> processDevicesChanged);
     void notifyStylusGestureStarted(int32_t deviceId, nsecs_t eventTime) override;
 
-    std::mutex mLock;
+    mutable std::mutex mLock;
     std::condition_variable mDevicesChangedCondition;
 
     InputReaderConfiguration mConfig;