diff --git a/funcs/qsortrgb.c b/funcs/qsortrgb.c
index 9a60153..65d50b3 100644
--- a/funcs/qsortrgb.c
+++ b/funcs/qsortrgb.c
@@ -36,7 +36,9 @@ if (fimg_images_not_compatible(psrc, pdst)) {
 	return -8;
 	}
 
-foo = fimg_copy_data(psrc, pdst);
+if (psrc != pdst) {		/* optimize or futurbug ? */
+	foo = fimg_copy_data(psrc, pdst);
+	}
 
 szimg = pdst->width * pdst->height;
 fprintf(stderr, "%s : %d pixels\n", __func__, szimg);