diff --git a/lib/ffmpeg/libavcodec/mpegvideo.c b/lib/ffmpeg/libavcodec/mpegvideo.c
index a0acda19c1296..31642e6fe26fe 100644
--- a/lib/ffmpeg/libavcodec/mpegvideo.c
+++ b/lib/ffmpeg/libavcodec/mpegvideo.c
@@ -1004,7 +1004,7 @@ int MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
             /* Allocate a dummy frame */
             i= ff_find_unused_picture(s, 0);
             s->next_picture_ptr= &s->picture[i];
-            s->last_picture_ptr->key_frame = 0;
+            s->next_picture_ptr->key_frame = 0;
             if(ff_alloc_picture(s, s->next_picture_ptr, 0) < 0)
                 return -1;
         }
diff --git a/lib/ffmpeg/patches/0048-Dont-mark-genereted-dummy-frame-as-keyframe.patch b/lib/ffmpeg/patches/0048-Dont-mark-genereted-dummy-frame-as-keyframe.patch
index ca454224fc58d..39e92bf100430 100644
--- a/lib/ffmpeg/patches/0048-Dont-mark-genereted-dummy-frame-as-keyframe.patch
+++ b/lib/ffmpeg/patches/0048-Dont-mark-genereted-dummy-frame-as-keyframe.patch
@@ -25,7 +25,7 @@ index c8706bc..a0acda1 100644
              /* Allocate a dummy frame */
              i= ff_find_unused_picture(s, 0);
              s->next_picture_ptr= &s->picture[i];
-+            s->last_picture_ptr->key_frame = 0;
++            s->next_picture_ptr->key_frame = 0;
              if(ff_alloc_picture(s, s->next_picture_ptr, 0) < 0)
                  return -1;
          }