diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index b6aa94e1ce..76dcdd5488 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -118,7 +118,6 @@ static av_cold void init_qpel(SnowContext *const s)
 void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h,
                               int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8){
     int y, x;
-    IDWTELEM * dst;
 
     av_assume(add); // add == 0 is currently unused
 
@@ -128,7 +127,9 @@ void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_
         const uint8_t *obmc2= obmc1+ (obmc_stride>>1);
         const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);
         const uint8_t *obmc4= obmc3+ (obmc_stride>>1);
-        dst = slice_buffer_get_line(sb, src_y + y);
+        IDWTELEM *dst = sb->line[src_y+y];
+        av_assert2(dst);
+
         for(x=0; x<b_w; x++){
             int v=   obmc1[x] * block[3][x + y*src_stride]
                     +obmc2[x] * block[2][x + y*src_stride]