diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index 9fe3919ca1..4d8d9689c7 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1247,8 +1247,9 @@ static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int
         if(s->width != r->si.width || s->height != r->si.height){
             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);
             MPV_common_end(s);
-            s->width  = s->avctx->width  = r->si.width;
-            s->height = s->avctx->height = r->si.height;
+            s->width  = r->si.width;
+            s->height = r->si.height;
+            avcodec_set_dimensions(s->avctx, s->width, s->height);
             if(MPV_common_init(s) < 0)
                 return -1;
             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));