diff --git a/Source/Core/Core/HW/BBA-TAP/TAP_Apple.cpp b/Source/Core/Core/HW/BBA-TAP/TAP_Apple.cpp
index 5681f0b507..6246c21bf3 100644
--- a/Source/Core/Core/HW/BBA-TAP/TAP_Apple.cpp
+++ b/Source/Core/Core/HW/BBA-TAP/TAP_Apple.cpp
@@ -43,7 +43,7 @@ bool CEXIETHERNET::IsActivated()
   return fd != -1;
 }
 
-bool CEXIETHERNET::SendFrame(u8* frame, u32 size)
+bool CEXIETHERNET::SendFrame(const u8* frame, u32 size)
 {
   INFO_LOG(SP1, "SendFrame %x\n%s", size, ArrayToString(frame, size, 0x10).c_str());
 
diff --git a/Source/Core/Core/HW/BBA-TAP/TAP_Unix.cpp b/Source/Core/Core/HW/BBA-TAP/TAP_Unix.cpp
index ad2f67cda0..0108706856 100644
--- a/Source/Core/Core/HW/BBA-TAP/TAP_Unix.cpp
+++ b/Source/Core/Core/HW/BBA-TAP/TAP_Unix.cpp
@@ -100,7 +100,7 @@ bool CEXIETHERNET::IsActivated()
 #endif
 }
 
-bool CEXIETHERNET::SendFrame(u8* frame, u32 size)
+bool CEXIETHERNET::SendFrame(const u8* frame, u32 size)
 {
 #ifdef __linux__
   INFO_LOG(SP1, "SendFrame %x\n%s", size, ArrayToString(frame, size, 0x10).c_str());
diff --git a/Source/Core/Core/HW/BBA-TAP/TAP_Win32.cpp b/Source/Core/Core/HW/BBA-TAP/TAP_Win32.cpp
index a3e16047ab..c817d370e6 100644
--- a/Source/Core/Core/HW/BBA-TAP/TAP_Win32.cpp
+++ b/Source/Core/Core/HW/BBA-TAP/TAP_Win32.cpp
@@ -307,7 +307,7 @@ static void ReadThreadHandler(CEXIETHERNET* self)
   }
 }
 
-bool CEXIETHERNET::SendFrame(u8* frame, u32 size)
+bool CEXIETHERNET::SendFrame(const u8* frame, u32 size)
 {
   DEBUG_LOG(SP1, "SendFrame %u bytes:\n%s", size, ArrayToString(frame, size, 0x10).c_str());
 
diff --git a/Source/Core/Core/HW/EXI_DeviceEthernet.cpp b/Source/Core/Core/HW/EXI_DeviceEthernet.cpp
index dd0aed4be9..42352c7d98 100644
--- a/Source/Core/Core/HW/EXI_DeviceEthernet.cpp
+++ b/Source/Core/Core/HW/EXI_DeviceEthernet.cpp
@@ -370,7 +370,7 @@ void CEXIETHERNET::MXCommandHandler(u32 data, u32 size)
   }
 }
 
-void CEXIETHERNET::DirectFIFOWrite(u8* data, u32 size)
+void CEXIETHERNET::DirectFIFOWrite(const u8* data, u32 size)
 {
   // In direct mode, the hardware handles creating the state required by the
   // GMAC instead of finagling with packet descriptors and such
@@ -412,7 +412,7 @@ void CEXIETHERNET::SendComplete()
   mBbaMem[BBA_LTPS] = 0;
 }
 
-inline u8 CEXIETHERNET::HashIndex(u8* dest_eth_addr)
+inline u8 CEXIETHERNET::HashIndex(const u8* dest_eth_addr)
 {
   // Calculate CRC
   u32 crc = 0xffffffff;
diff --git a/Source/Core/Core/HW/EXI_DeviceEthernet.h b/Source/Core/Core/HW/EXI_DeviceEthernet.h
index 26f0e8e28d..c73d1c9df7 100644
--- a/Source/Core/Core/HW/EXI_DeviceEthernet.h
+++ b/Source/Core/Core/HW/EXI_DeviceEthernet.h
@@ -297,11 +297,11 @@ public:
   const char* GetRegisterName() const;
   void MXHardReset();
   void MXCommandHandler(u32 data, u32 size);
-  void DirectFIFOWrite(u8* data, u32 size);
+  void DirectFIFOWrite(const u8* data, u32 size);
   void SendFromDirectFIFO();
   void SendFromPacketBuffer();
   void SendComplete();
-  u8 HashIndex(u8* dest_eth_addr);
+  u8 HashIndex(const u8* dest_eth_addr);
   bool RecvMACFilter();
   void inc_rwp();
   bool RecvHandlePacket();
@@ -313,7 +313,7 @@ public:
   bool Activate();
   void Deactivate();
   bool IsActivated();
-  bool SendFrame(u8* frame, u32 size);
+  bool SendFrame(const u8* frame, u32 size);
   bool RecvInit();
   void RecvStart();
   void RecvStop();