diff --git a/src/radeon_exa_funcs.c b/src/radeon_exa_funcs.c
index 55710ff..3574b25 100644
--- a/src/radeon_exa_funcs.c
+++ b/src/radeon_exa_funcs.c
@@ -403,7 +403,7 @@ FUNC_NAME(RADEONDownloadFromScreen)(PixmapPtr pSrc, int x, int y, int w, int h,
      */
     if (info->accelDFS && bpp != 24 && RADEONGetDatatypeBpp(bpp, &datatype) &&
 	RADEONGetPixmapOffsetPitch(pSrc, &src_pitch_offset) &&
-	(scratch = RADEONCPGetBuffer(pScrn)))
+	(scratch = RADEONCPGetBuffer(pScrn)) && (w > 32) && (h > 32))
     {
 	int swap = RADEON_HOST_DATA_SWAP_NONE, wpass = w * bpp / 8;
 	int hpass = min(h, scratch->total/2 / scratch_pitch);