diff --git a/libavcodec/pictordec.c b/libavcodec/pictordec.c
index 1bc51bcf24..a60cfcbefc 100644
--- a/libavcodec/pictordec.c
+++ b/libavcodec/pictordec.c
@@ -142,7 +142,7 @@ static int decode_frame(AVCodecContext *avctx,
 
     if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
         return -1;
-    if (s->width != avctx->width && s->height != avctx->height) {
+    if (s->width != avctx->width || s->height != avctx->height) {
         ret = ff_set_dimensions(avctx, s->width, s->height);
         if (ret < 0)
             return ret;