diff --git a/dlls/windowscodecs/converter.c b/dlls/windowscodecs/converter.c
index 11111111111..11111111111 100644
--- a/dlls/windowscodecs/converter.c
+++ b/dlls/windowscodecs/converter.c
@@ -1034,6 +1034,50 @@ static HRESULT copypixels_to_24bppBGR(struct FormatConverter *This, const WICRec
 
     switch (source_format)
     {
+    case format_8bppGray:
+        if (prc)
+        {
+            HRESULT res;
+            INT x, y;
+            BYTE *srcdata;
+            UINT srcstride, srcdatasize;
+            const BYTE *srcrow;
+            const BYTE *srcbyte;
+            BYTE *dstrow;
+            BYTE *dstpixel;
+
+            srcstride = prc->Width;
+            srcdatasize = srcstride * prc->Height;
+
+            srcdata = HeapAlloc(GetProcessHeap(), 0, srcdatasize);
+            if (!srcdata) return E_OUTOFMEMORY;
+
+            res = IWICBitmapSource_CopyPixels(This->source, prc, srcstride, srcdatasize, srcdata);
+
+            if (SUCCEEDED(res))
+            {
+                srcrow = srcdata;
+                dstrow = pbBuffer;
+                for (y=0; y<prc->Height; y++) {
+                    srcbyte = srcrow;
+                    dstpixel = dstrow;
+                    for (x=0; x<prc->Width; x++)
+                    {
+                        *dstpixel++ = *srcbyte;
+                        *dstpixel++ = *srcbyte;
+                        *dstpixel++ = *srcbyte;
+                        srcbyte++;
+                    }
+                    srcrow += srcstride;
+                    dstrow += cbStride;
+                }
+            }
+
+            HeapFree(GetProcessHeap(), 0, srcdata);
+
+            return res;
+        }
+        return S_OK;
     case format_24bppBGR:
     case format_24bppRGB:
         if (prc)