diff --git a/src/search.cpp b/src/search.cpp
index 6a464961a61..03f8d22c837 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -801,7 +801,7 @@ Value Search::Worker::search(
 
             // Do verification search at high depths, with null move pruning disabled
             // until ply exceeds nmpMinPly.
-            thisThread->nmpMinPly = ss->ply + 3 * (depth - R) / 4;
+            thisThread->nmpMinPly = ss->ply + depth / 4;
 
             Value v = search<NonPV>(pos, ss, beta - 1, beta, depth - R, false);