diff --git a/Source/Core/InputCommon/ControllerInterface/Device.cpp b/Source/Core/InputCommon/ControllerInterface/Device.cpp
index 9e29389dae..9fbeae22cf 100644
--- a/Source/Core/InputCommon/ControllerInterface/Device.cpp
+++ b/Source/Core/InputCommon/ControllerInterface/Device.cpp
@@ -256,7 +256,7 @@ bool DeviceContainer::HasConnectedDevice(const DeviceQualifier& qualifier) const
 // and also properly handles detection when using "FullAnalogSurface" inputs.
 // Upon input, return the detected Device and Input, else return nullptrs
 std::pair<std::shared_ptr<Device>, Device::Input*>
-DeviceContainer::DetectInput(u32 wait_ms, std::vector<std::string> device_strings)
+DeviceContainer::DetectInput(u32 wait_ms, const std::vector<std::string>& device_strings)
 {
   struct InputState
   {
@@ -273,7 +273,7 @@ DeviceContainer::DetectInput(u32 wait_ms, std::vector<std::string> device_string
 
   // Acquire devices and initial input states.
   std::vector<DeviceState> device_states;
-  for (auto& device_string : device_strings)
+  for (const auto& device_string : device_strings)
   {
     DeviceQualifier dq;
     dq.FromString(device_string);
diff --git a/Source/Core/InputCommon/ControllerInterface/Device.h b/Source/Core/InputCommon/ControllerInterface/Device.h
index b5a8695629..fd947ee654 100644
--- a/Source/Core/InputCommon/ControllerInterface/Device.h
+++ b/Source/Core/InputCommon/ControllerInterface/Device.h
@@ -188,7 +188,7 @@ public:
   bool HasConnectedDevice(const DeviceQualifier& qualifier) const;
 
   std::pair<std::shared_ptr<Device>, Device::Input*>
-  DetectInput(u32 wait_ms, std::vector<std::string> device_strings);
+  DetectInput(u32 wait_ms, const std::vector<std::string>& device_strings);
 
 protected:
   mutable std::mutex m_devices_mutex;