diff --git a/Source/Core/DiscIO/VolumeDirectory.cpp b/Source/Core/DiscIO/VolumeDirectory.cpp
index e0ab8acd4f..3a9e75f1d2 100644
--- a/Source/Core/DiscIO/VolumeDirectory.cpp
+++ b/Source/Core/DiscIO/VolumeDirectory.cpp
@@ -152,7 +152,7 @@ std::string CVolumeDirectory::GetUniqueID() const
 	return std::string(m_diskHeader.begin(), m_diskHeader.begin() + ID_LENGTH);
 }
 
-void CVolumeDirectory::SetUniqueID(std::string id)
+void CVolumeDirectory::SetUniqueID(const std::string& id)
 {
 	size_t length = id.length();
 	if (length > 6)
@@ -178,7 +178,7 @@ std::vector<std::string> CVolumeDirectory::GetNames() const
 	return std::vector<std::string>(1, (char*)(&m_diskHeader[0x20]));
 }
 
-void CVolumeDirectory::SetName(std::string name)
+void CVolumeDirectory::SetName(const std::string& name)
 {
 	size_t length = name.length();
 	if (length > MAX_NAME_LENGTH)
diff --git a/Source/Core/DiscIO/VolumeDirectory.h b/Source/Core/DiscIO/VolumeDirectory.h
index f32d628e58..6cfcd90004 100644
--- a/Source/Core/DiscIO/VolumeDirectory.h
+++ b/Source/Core/DiscIO/VolumeDirectory.h
@@ -36,12 +36,12 @@ public:
 	bool RAWRead(u64 _Offset, u64 _Length, u8* _pBuffer) const override;
 
 	std::string GetUniqueID() const override;
-	void SetUniqueID(std::string _ID);
+	void SetUniqueID(const std::string& _ID);
 
 	std::string GetMakerID() const override;
 
 	std::vector<std::string> GetNames() const override;
-	void SetName(std::string);
+	void SetName(const std::string&);
 
 	u32 GetFSTSize() const override;