diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c
index 076ad41519..2b89048cde 100644
--- a/libavfilter/vf_yadif.c
+++ b/libavfilter/vf_yadif.c
@@ -158,6 +158,8 @@ static void filter_edges_16bit(void *dst1, void *prev1, void *cur1, void *next1,
     int x;
     uint16_t *prev2 = parity ? prev : cur ;
     uint16_t *next2 = parity ? cur  : next;
+    mrefs /= 2;
+    prefs /= 2;
 
     FILTER(0, 3, 0)