diff --git a/src/search.cpp b/src/search.cpp
index 6cb42cc3..c69b2408 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -152,7 +152,7 @@ namespace {
 void Search::init() {
 
   for (int i = 1; i < MAX_MOVES; ++i)
-      Reductions[i] = int((21.3 + 2 * std::log(Threads.size())) * std::log(i + 0.25 * std::log(i)));
+      Reductions[i] = int(21.3 * std::log(i + 0.25 * std::log(i)));
 }