diff --git a/Source/Core/VideoBackends/D3D/D3DTexture.cpp b/Source/Core/VideoBackends/D3D/D3DTexture.cpp
index fb5e710711..abafce3e90 100644
--- a/Source/Core/VideoBackends/D3D/D3DTexture.cpp
+++ b/Source/Core/VideoBackends/D3D/D3DTexture.cpp
@@ -11,40 +11,6 @@
 
 namespace DX11
 {
-namespace D3D
-{
-void ReplaceRGBATexture2D(ID3D11Texture2D* pTexture, const u8* buffer, unsigned int width,
-                          unsigned int height, unsigned int src_pitch, unsigned int level,
-                          D3D11_USAGE usage)
-{
-  if (usage == D3D11_USAGE_DYNAMIC || usage == D3D11_USAGE_STAGING)
-  {
-    D3D11_MAPPED_SUBRESOURCE map;
-    D3D::context->Map(pTexture, level, D3D11_MAP_WRITE_DISCARD, 0, &map);
-    if (src_pitch == map.RowPitch)
-    {
-      memcpy(map.pData, buffer, map.RowPitch * height);
-    }
-    else
-    {
-      // Source row size is aligned to texture block size. This can result in a different
-      // pitch to what the driver returns, so copy whichever is smaller.
-      unsigned int copy_size = std::min(src_pitch, map.RowPitch);
-      for (unsigned int y = 0; y < height; ++y)
-        memcpy((u8*)map.pData + y * map.RowPitch, buffer + y * src_pitch, copy_size);
-    }
-    D3D::context->Unmap(pTexture, level);
-  }
-  else
-  {
-    D3D11_BOX dest_region = CD3D11_BOX(0, 0, 0, width, height, 1);
-    D3D::context->UpdateSubresource(pTexture, level, &dest_region, buffer, src_pitch,
-                                    src_pitch * height);
-  }
-}
-
-}  // namespace
-
 D3DTexture2D* D3DTexture2D::Create(unsigned int width, unsigned int height, D3D11_BIND_FLAG bind,
                                    D3D11_USAGE usage, DXGI_FORMAT fmt, unsigned int levels,
                                    unsigned int slices, D3D11_SUBRESOURCE_DATA* data)
diff --git a/Source/Core/VideoBackends/D3D/D3DTexture.h b/Source/Core/VideoBackends/D3D/D3DTexture.h
index 7ce8f45ac1..2908ccf6ce 100644
--- a/Source/Core/VideoBackends/D3D/D3DTexture.h
+++ b/Source/Core/VideoBackends/D3D/D3DTexture.h
@@ -9,13 +9,6 @@
 
 namespace DX11
 {
-namespace D3D
-{
-void ReplaceRGBATexture2D(ID3D11Texture2D* pTexture, const u8* buffer, unsigned int width,
-                          unsigned int height, unsigned int src_pitch, unsigned int level,
-                          D3D11_USAGE usage);
-}
-
 class D3DTexture2D
 {
 public: