diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index 70110dfea9..e71fed2877 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -3573,7 +3573,7 @@ static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
         dst[i+0] = src1[i+0]-src2[i+0];
 }
 
-static void add_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *diff, int w, int *left, int *left_top){
+static void add_hfyu_median_prediction_c(uint8_t *dst, const uint8_t *src1, uint8_t *diff, int w, int *left, int *left_top){
     int i;
     uint8_t l, lt;
 
@@ -3590,7 +3590,7 @@ static void add_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *d
     *left_top= lt;
 }
 
-static void sub_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w, int *left, int *left_top){
+static void sub_hfyu_median_prediction_c(uint8_t *dst, const uint8_t *src1, uint8_t *src2, int w, int *left, int *left_top){
     int i;
     uint8_t l, lt;
 
@@ -3608,7 +3608,7 @@ static void sub_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *s
     *left_top= lt;
 }
 
-static int add_hfyu_left_prediction_c(uint8_t *dst, uint8_t *src, int w, int acc){
+static int add_hfyu_left_prediction_c(uint8_t *dst, const uint8_t *src, int w, int acc){
     int i;
 
     for(i=0; i<w-1; i++){
@@ -3636,7 +3636,7 @@ static int add_hfyu_left_prediction_c(uint8_t *dst, uint8_t *src, int w, int acc
 #define G 1
 #define R 2
 #endif
-static inline void add_hfyu_left_prediction_bgr32_c(uint8_t *dst, uint8_t *src, int w, int *red, int *green, int *blue){
+static inline void add_hfyu_left_prediction_bgr32_c(uint8_t *dst, const uint8_t *src, int w, int *red, int *green, int *blue){
     int i;
     int r,g,b;
     r= *red;
diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h
index b94c2f910a..6cb5af2cc5 100644
--- a/libavcodec/dsputil.h
+++ b/libavcodec/dsputil.h
@@ -347,10 +347,10 @@ typedef struct DSPContext {
      * subtract huffyuv's variant of median prediction
      * note, this might read from src1[-1], src2[-1]
      */
-    void (*sub_hfyu_median_prediction)(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w, int *left, int *left_top);
-    void (*add_hfyu_median_prediction)(uint8_t *dst, uint8_t *top, uint8_t *diff, int w, int *left, int *left_top);
-    int  (*add_hfyu_left_prediction)(uint8_t *dst, uint8_t *src, int w, int acc);
-    void (*add_hfyu_left_prediction_bgr32)(uint8_t *dst, uint8_t *src, int w, int *red, int *green, int *blue);
+    void (*sub_hfyu_median_prediction)(uint8_t *dst, const uint8_t *src1, uint8_t *src2, int w, int *left, int *left_top);
+    void (*add_hfyu_median_prediction)(uint8_t *dst, const uint8_t *top, uint8_t *diff, int w, int *left, int *left_top);
+    int  (*add_hfyu_left_prediction)(uint8_t *dst, const uint8_t *src, int w, int acc);
+    void (*add_hfyu_left_prediction_bgr32)(uint8_t *dst, const uint8_t *src, int w, int *red, int *green, int *blue);
     /* this might write to dst[w] */
     void (*add_png_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
     void (*bswap_buf)(uint32_t *dst, const uint32_t *src, int w);