diff --git a/dlls/gdiplus/image.c b/dlls/gdiplus/image.c
index eec76f6033f..e6921f55a0d 100644
--- a/dlls/gdiplus/image.c
+++ b/dlls/gdiplus/image.c
@@ -3876,11 +3876,6 @@ GpStatus WINGDIPAPI GdipSaveImageToFile(GpImage *image, GDIPCONST WCHAR* filenam
  * Encoding functions -
  *   These functions encode an image in different image file formats.
  */
-#define BITMAP_FORMAT_BMP   0x4d42 /* "BM" */
-#define BITMAP_FORMAT_JPEG  0xd8ff
-#define BITMAP_FORMAT_GIF   0x4947
-#define BITMAP_FORMAT_PNG   0x5089
-#define BITMAP_FORMAT_APM   0xcdd7
 
 static GpStatus encode_image_WIC(GpImage *image, IStream* stream,
     GDIPCONST CLSID* clsid, GDIPCONST EncoderParameters* params)