diff --git a/av1/encoder/arm/neon/highbd_pickrst_neon.c b/av1/encoder/arm/neon/highbd_pickrst_neon.c
index 72b1f62..76e0344 100644
--- a/av1/encoder/arm/neon/highbd_pickrst_neon.c
+++ b/av1/encoder/arm/neon/highbd_pickrst_neon.c
@@ -337,7 +337,7 @@
 
     src += src_stride;
   } while (--h != 0);
-  return (horizontal_add_s64x2(sum_s64) + sum) / (height * width);
+  return (int16_t)((horizontal_add_s64x2(sum_s64) + sum) / (height * width));
 }
 
 static INLINE void compute_H_one_col(int16x8_t *dgd, int col, int64_t *H,