diff --git a/src/search.cpp b/src/search.cpp
index 79451704..cf380b31 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -686,7 +686,7 @@ namespace {
     // Step 8. Null move search with verification search (is omitted in PV nodes)
     if (   !PvNode
         &&  eval >= beta
-        && (ss->staticEval >= beta - 35 * (depth / ONE_PLY - 6) || depth >= 13 * ONE_PLY)
+        &&  ss->staticEval >= beta - 36 * depth / ONE_PLY + 225
         &&  pos.non_pawn_material(pos.side_to_move()))
     {