diff --git a/src/CxbxKrnl/EmuD3D8.cpp b/src/CxbxKrnl/EmuD3D8.cpp
index b6b2b1c90..b9aa57f03 100644
--- a/src/CxbxKrnl/EmuD3D8.cpp
+++ b/src/CxbxKrnl/EmuD3D8.cpp
@@ -5766,7 +5766,7 @@ HRESULT WINAPI XTL::EMUPATCH(IDirect3DTexture8_GetSurfaceLevel)
 // ******************************************************************
 // * func: EmuIDirect3DVolumeTexture8_LockBox
 // ******************************************************************
-HRESULT WINAPI XTL::EMUPATCH(IDirect3DVolumeTexture8_LockBox)
+HRESULT WINAPI XTL::EMUPATCH(D3DVolumeTexture_LockBox)
 (
     X_D3DVolumeTexture *pThis,
     UINT                Level,
diff --git a/src/CxbxKrnl/EmuD3D8.h b/src/CxbxKrnl/EmuD3D8.h
index 37779fbb2..7feaa29dc 100644
--- a/src/CxbxKrnl/EmuD3D8.h
+++ b/src/CxbxKrnl/EmuD3D8.h
@@ -799,7 +799,7 @@ HRESULT WINAPI EMUPATCH(IDirect3DTexture8_GetSurfaceLevel)
 // ******************************************************************
 // * func: EmuIDirect3DVolumeTexture8_LockBox
 // ******************************************************************
-HRESULT WINAPI EMUPATCH(IDirect3DVolumeTexture8_LockBox)
+HRESULT WINAPI EMUPATCH(D3DVolumeTexture_LockBox)
 (
     X_D3DVolumeTexture *pThis,
     UINT                Level,