diff --git a/av1/encoder/pickrst.c b/av1/encoder/pickrst.c
index 2249198..4925a3d 100644
--- a/av1/encoder/pickrst.c
+++ b/av1/encoder/pickrst.c
@@ -1274,7 +1274,7 @@
   const int wiener_halfwin = (wiener_win >> 1);
 
   for (i = 0; i < wiener_halfwin; ++i) {
-    const int64_t dividend = f[i] * WIENER_FILT_STEP;
+    const int64_t dividend = (int64_t)f[i] * WIENER_FILT_STEP;
     const int64_t divisor = WIENER_TAP_SCALE_FACTOR;
     // Perform this division with proper rounding rather than truncation
     if (dividend < 0) {