diff --git a/libavutil/frame.c b/libavutil/frame.c
index 654f17428b..39e2a1313a 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -244,7 +244,7 @@ int av_frame_get_buffer(AVFrame *frame, int align)
     return AVERROR(EINVAL);
 }
 
-int av_frame_ref(AVFrame *dst, AVFrame *src)
+int av_frame_ref(AVFrame *dst, const AVFrame *src)
 {
     int i, ret = 0;
 
@@ -335,7 +335,7 @@ fail:
     return ret;
 }
 
-AVFrame *av_frame_clone(AVFrame *src)
+AVFrame *av_frame_clone(const AVFrame *src)
 {
     AVFrame *ret = av_frame_alloc();
 
diff --git a/libavutil/frame.h b/libavutil/frame.h
index 1c785ddbe3..3be6892020 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -549,7 +549,7 @@ void av_frame_free(AVFrame **frame);
  *
  * @return 0 on success, a negative AVERROR on error
  */
-int av_frame_ref(AVFrame *dst, AVFrame *src);
+int av_frame_ref(AVFrame *dst, const AVFrame *src);
 
 /**
  * Create a new frame that references the same data as src.
@@ -558,7 +558,7 @@ int av_frame_ref(AVFrame *dst, AVFrame *src);
  *
  * @return newly created AVFrame on success, NULL on error.
  */
-AVFrame *av_frame_clone(AVFrame *src);
+AVFrame *av_frame_clone(const AVFrame *src);
 
 /**
  * Unreference all the buffers referenced by frame and reset the frame fields.