diff --git a/src/gx/CGxDevice.cpp b/src/gx/CGxDevice.cpp
index 304d044..1a354b7 100644
--- a/src/gx/CGxDevice.cpp
+++ b/src/gx/CGxDevice.cpp
@@ -194,7 +194,7 @@ int32_t CGxDevice::BufUnlock(CGxBuf* buf, uint32_t size) {
     return 1;
 }
 
-void CGxDevice::BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset) {
+void CGxDevice::BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset) {
     buf->unk1E = 1;
     buf->unk1F = 0;
 }
diff --git a/src/gx/CGxDevice.hpp b/src/gx/CGxDevice.hpp
index 312ae15..16a7216 100644
--- a/src/gx/CGxDevice.hpp
+++ b/src/gx/CGxDevice.hpp
@@ -120,7 +120,7 @@ class CGxDevice {
         virtual void PoolSizeSet(CGxPool*, uint32_t) = 0;
         virtual char* BufLock(CGxBuf*);
         virtual int32_t BufUnlock(CGxBuf*, uint32_t);
-        virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
+        virtual void BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset);
         virtual int32_t TexCreate(EGxTexTarget, uint32_t, uint32_t, uint32_t, EGxTexFormat, EGxTexFormat, CGxTexFlags, void*, void (*)(EGxTexCommand, uint32_t, uint32_t, uint32_t, uint32_t, void*, uint32_t&, const void*&), const char*, CGxTex*&);
         virtual void TexDestroy(CGxTex* texId);
         virtual void ShaderCreate(CGxShader*[], EGxShTarget, const char*, const char*, int32_t);
diff --git a/src/gx/d3d/CGxDeviceD3d.cpp b/src/gx/d3d/CGxDeviceD3d.cpp
index 5d4a808..d0fb4ed 100644
--- a/src/gx/d3d/CGxDeviceD3d.cpp
+++ b/src/gx/d3d/CGxDeviceD3d.cpp
@@ -394,7 +394,7 @@ int32_t CGxDeviceD3d::BufUnlock(CGxBuf* buf, uint32_t size) {
     return 1;
 }
 
-void CGxDeviceD3d::BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset) {
+void CGxDeviceD3d::BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset) {
     CGxDevice::BufData(buf, data, size, offset);
 
     auto bufData = this->IBufLock(buf);
diff --git a/src/gx/d3d/CGxDeviceD3d.hpp b/src/gx/d3d/CGxDeviceD3d.hpp
index 9a59d20..18437d9 100644
--- a/src/gx/d3d/CGxDeviceD3d.hpp
+++ b/src/gx/d3d/CGxDeviceD3d.hpp
@@ -258,7 +258,7 @@ class CGxDeviceD3d : public CGxDevice {
     virtual void PoolSizeSet(CGxPool* pool, uint32_t size);
     virtual char* BufLock(CGxBuf* buf);
     virtual int32_t BufUnlock(CGxBuf* buf, uint32_t size);
-    virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
+    virtual void BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset);
     virtual void IShaderCreate(CGxShader* shader);
     virtual void ShaderCreate(CGxShader* shaders[], EGxShTarget target, const char* a4, const char* a5, int32_t permutations);
     virtual int32_t StereoEnabled();
diff --git a/src/gx/gll/CGxDeviceGLL.cpp b/src/gx/gll/CGxDeviceGLL.cpp
index f82890d..244ac4f 100644
--- a/src/gx/gll/CGxDeviceGLL.cpp
+++ b/src/gx/gll/CGxDeviceGLL.cpp
@@ -117,7 +117,7 @@ int32_t CGxDeviceGLL::BufUnlock(CGxBuf* buf, uint32_t size) {
     return this->IBufUnlock(buf);
 }
 
-void CGxDeviceGLL::BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset) {
+void CGxDeviceGLL::BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset) {
     CGxDevice::BufData(buf, data, size, offset);
 
     auto bufData = this->IBufLock(buf);
diff --git a/src/gx/gll/CGxDeviceGLL.hpp b/src/gx/gll/CGxDeviceGLL.hpp
index e5940cc..c311698 100644
--- a/src/gx/gll/CGxDeviceGLL.hpp
+++ b/src/gx/gll/CGxDeviceGLL.hpp
@@ -43,7 +43,7 @@ class CGxDeviceGLL : public CGxDevice {
         virtual void PoolSizeSet(CGxPool*, uint32_t);
         virtual char* BufLock(CGxBuf*);
         virtual int32_t BufUnlock(CGxBuf*, uint32_t);
-        virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
+        virtual void BufData(CGxBuf* buf, const void* data, size_t size, uintptr_t offset);
         virtual void TexDestroy(CGxTex* texId);
         virtual void IShaderCreate(CGxShader*);
         virtual void ShaderCreate(CGxShader*[], EGxShTarget, const char*, const char*, int32_t);