diff --git a/src/search.cpp b/src/search.cpp
index 286b339c0..7068c332d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -99,7 +99,7 @@ void update_correction_history(const Position& pos,
     const Move  m  = (ss - 1)->currentMove;
     const Color us = pos.side_to_move();
 
-    const int nonPawnWeight = 165;
+    constexpr int nonPawnWeight = 165;
 
     workerThread.pawnCorrectionHistory[pawn_correction_history_index(pos)][us] << bonus;
     workerThread.minorPieceCorrectionHistory[minor_piece_index(pos)][us] << bonus * 145 / 128;
@@ -839,7 +839,7 @@ Value Search::Worker::search(
     // The depth condition is important for mate finding.
     {
         auto futility_margin = [&](Depth d) {
-            Value futilityMult = 91 - 21 * (!ss->ttHit);
+            Value futilityMult = 91 - 21 * !ss->ttHit;
 
             return futilityMult * d                                //
                  - 2094 * improving * futilityMult / 1024          //
@@ -1855,7 +1855,7 @@ void update_all_stats(const Position& pos,
 // Updates histories of the move pairs formed by moves
 // at ply -1, -2, -3, -4, and -6 with current move.
 void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
-    const std::array<ConthistBonus, 6> conthist_bonuses = {
+    static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {
       {{1, 1157}, {2, 648}, {3, 288}, {4, 576}, {5, 140}, {6, 441}}};
 
     for (const auto [i, weight] : conthist_bonuses)