diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index b5f04e7e16..6a4c466b44 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -1847,7 +1847,8 @@ static int decode_frame(AVCodecContext *avctx,
                     buf += s->planesize;
                 }
             }
-            memcpy(frame->data[1], s->pal, 256 * 4);
+            if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
+                memcpy(frame->data[1], s->pal, 256 * 4);
         } else if (s->ham) {
             int i, count = 1 << s->ham;