diff --git a/Source/Core/Core/HW/EXI_DeviceAGP.cpp b/Source/Core/Core/HW/EXI_DeviceAGP.cpp
index 5b1e5038b0..667c344482 100644
--- a/Source/Core/Core/HW/EXI_DeviceAGP.cpp
+++ b/Source/Core/Core/HW/EXI_DeviceAGP.cpp
@@ -63,7 +63,7 @@ void CEXIAgp::LoadRom()
 	INFO_LOG(EXPANSIONINTERFACE, "Loaded GBA sav: %s card: %d", gbapath.c_str(), m_slot);
 }
 
-void CEXIAgp::LoadFileToROM(std::string filename)
+void CEXIAgp::LoadFileToROM(const std::string& filename)
 {
 	File::IOFile pStream(filename, "rb");
 	if (pStream)
@@ -83,7 +83,7 @@ void CEXIAgp::LoadFileToROM(std::string filename)
 	}
 }
 
-void CEXIAgp::LoadFileToEEPROM(std::string filename)
+void CEXIAgp::LoadFileToEEPROM(const std::string& filename)
 {
 	File::IOFile pStream(filename, "rb");
 	if (pStream)
@@ -98,7 +98,7 @@ void CEXIAgp::LoadFileToEEPROM(std::string filename)
 	}
 }
 
-void CEXIAgp::SaveFileFromEEPROM(std::string filename)
+void CEXIAgp::SaveFileFromEEPROM(const std::string& filename)
 {
 	File::IOFile pStream(filename, "wb");
 	if (pStream)
diff --git a/Source/Core/Core/HW/EXI_DeviceAGP.h b/Source/Core/Core/HW/EXI_DeviceAGP.h
index 77b88b09fa..a591e70c10 100644
--- a/Source/Core/Core/HW/EXI_DeviceAGP.h
+++ b/Source/Core/Core/HW/EXI_DeviceAGP.h
@@ -47,9 +47,9 @@ private:
 	u8  m_eeprom_pos = 0;
 	u16 m_eeprom_cmd = 0;
 
-	void LoadFileToROM(std::string filename);
-	void LoadFileToEEPROM(std::string filename);
-	void SaveFileFromEEPROM(std::string filename);
+	void LoadFileToROM(const std::string& filename);
+	void LoadFileToEEPROM(const std::string& filename);
+	void SaveFileFromEEPROM(const std::string& filename);
 	void LoadHash();
 	void LoadRom();
 	void DoHash(u8* data, u32 size);