diff --git a/av1/encoder/var_based_part.c b/av1/encoder/var_based_part.c
index aada04d..c6d0f05 100644
--- a/av1/encoder/var_based_part.c
+++ b/av1/encoder/var_based_part.c
@@ -424,7 +424,7 @@
         thresholds[2] <<= 5;
         thresholds[3] = INT32_MAX;
       } else if (cm->width * cm->height > 640 * 480 && segment_id == 0) {
-        thresholds[0] <<= 2;
+        thresholds[0] = (3 * thresholds[0]) >> 1;
         thresholds[3] = INT32_MAX;
         if (current_qindex >= QINDEX_LARGE_BLOCK_THR) {
           thresholds[1] <<= 1;